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Contraceptive choice and acceptability: the future for STI risk in Kelantan, Malaysia

Shiely F, Saifuddin MS

Int J STD AIDS, 2014 Mar;25(3):219-27.
PMID: 23970646 DOI: 10.1177/0956462413497699

More than 150 million women become pregnant in developing countries annually and an estimated 287,000 die from pregnancy-related causes. Contraception is vital to prevent unnecessary maternal deaths, as well as sexually transmitted infections. The objective of this study was to investigate preferred contraceptive methods and the factors that influence contraceptive choice among women in Kelantan, Malaysia. A cross-sectional study using interview-based questionnaires was conducted, during July and August 2009, in local family planning clinics in Kelantan. The questionnaire was administered to adult women (age 20-50). Prevalence of unplanned pregnancies was high (48%). Contraceptive preference was Depo contraceptive injection (32%), oral contraceptive pills (27%), intrauterine devices (15%) and contraceptive implants (12%); 9% used condoms. Only 2% used contraception to protect against sexually transmitted infections or HIV/AIDS. Younger women (OR 0.90; 95% CI 0.807-0.993) were more likely to use contraception. In conclusion, non-interrupted contraceptive methods were preferred. More than 60% would stop using contraception if it interrupted intercourse. From both a public health and infectious disease perspective, this is extremely worrying.

Matched MeSH terms: Sexual Behavior
Fulltext Knowledge of sexually transmitted diseases and sexual behaviours among Malaysian male youths

Awang H, Wong LP, Jani R, Low WY

J Biosoc Sci, 2014 Mar;46(2):214-24.
PMID: 23480474 DOI: 10.1017/S0021932013000114

This study examines the knowledge of sexually transmitted diseases (STDs) among male youths in Malaysia. A self-administered survey was carried out on a sample of 952 never-married males aged 15-24 years. The respondents were asked about their knowledge of STDs, how these diseases get transmitted and their sexual behaviours. The data showed that 92% of the respondents knew of at least one STD (syphilis, gonorrhoea, chlamydia, herpes, genital warts, yeast infection, trichomoniasis or HIV/AIDS). About 95% of them knew of at least one method of STD transmission. Urban and tertiary-educated male youths showed a substantially higher proportion of awareness of STDs and transmission methods compared with their rural and less-educated counterparts. The data also indicated that 10% of the study sample admitted to having had sexual experiences. There were still a large proportion of the respondents who were not aware of STDs other than syphilis and HIV/AIDS and the means of transmission, such as multiple sex partners, including those who claimed to be sexually active. Thus there is a need for more concerted efforts to disseminate information on STDs and transmission methods to a wider audience in Malaysia, especially youths in rural areas.

Matched MeSH terms: Sexual Behavior*
Pre-marital sex and its predicting factors among Malaysian youths

Manaf MR, Tahir MM, Sidi H, Midin M, Nik Jaafar NR, Das S, et al.

Compr Psychiatry, 2014 Jan;55 Suppl 1:S82-8.
PMID: 23587530 DOI: 10.1016/j.comppsych.2013.03.008

This study aimed to examine the prevalence of pre-marital sex and its predicting factors among youth trainees undergoing a national skill training programme in the state of Malaysia.

Matched MeSH terms: Sexual Behavior/ethnology*
The relationship between sexual functioning among couples undergoing infertility treatment: a pair of perfect gloves

Yeoh SH, Razali R, Sidi H, Razi ZR, Midin M, Nik Jaafar NR, et al.

Compr Psychiatry, 2014 Jan;55 Suppl 1:S1-6.
PMID: 23116967 DOI: 10.1016/j.comppsych.2012.09.002

The study aimed to measure the relationship of sexual functioning between male and female partners, who sought infertility treatment in a university hospital setting in Malaysia.

Matched MeSH terms: Sexual Behavior/physiology; Sexual Behavior/psychology*
Duration of hypertension and antihypertensive agents in correlation with the phases of female sexual response cycle

Latif RA, Muhamad R, Ann AY, Sidi H, Nik Jaafar NR, Midin M, et al.

Compr Psychiatry, 2014 Jan;55 Suppl 1:S7-12.
PMID: 23206495 DOI: 10.1016/j.comppsych.2012.10.008

This cross-sectional study aimed to determine the construct of the phases of the female sexual response cycle (SRC) in women with hypertension and their association with the duration of hypertension and types of antihypertensive agents.

Matched MeSH terms: Sexual Behavior/drug effects*
Factor analysis study on sexual responses in women with type 2 diabetes mellitus

Ismail AH, Bau R, Sidi H, Guan NC, Naing L, Nik Jaafar NR, et al.

Compr Psychiatry, 2014 Jan;55 Suppl 1:S34-7.
PMID: 23375262 DOI: 10.1016/j.comppsych.2012.12.028

This study compared the components of sexual responses between Malaysian women with Type 2 diabetes mellitus and those without the disease.

Matched MeSH terms: Sexual Behavior/physiology*
Racial and socioeconomic disparities in sexual activity among older married Malaysians

Momtaz YA, Hamid TA, Ibrahim R, Akahbar SA

Arch Gerontol Geriatr, 2014 Jan-Feb;58(1):51-5.
PMID: 24021247 DOI: 10.1016/j.archger.2013.08.003

Sexuality as an important part of life has not been well studied in Malaysia, particularly among older adults. The main aim of this study was to investigate the racial and socioeconomic differences in sexual activity among older married Malaysians. Data for this study consisting of 1036 older married adults aged 60 years and older were obtained from the nationwide community-based cross-sectional survey entitled "Determinants of Wellness among Older Malaysian: A Health Promotion Perspective", conducted in 2010. Data were analyzed using SPSS version 21 for Windows. The results showed that 57.3% (95% CI: 54.3-60.3) of the respondents (61.6% of men and 50.6% of women) had engaged in sexual intercourse during the last 12 months. The adjusted multivariate logistic regression analysis revealed that ethnicity and educational attainment were independently and significantly associated with sexual activity, after controlling for the possible confounding effects of chronic medical conditions and demographic characteristics. The findings from this study do support the notion that sexuality is a lifelong need and cultural teachings and formal education may have important role in maintaining the quality of sexuality in later life.

Matched MeSH terms: Sexual Behavior/statistics & numerical data*
Fulltext Sociodemographic profile, contraceptive practice and awareness of HIV infection among unmarried postpartum women in a tertiary centre in Malaysia

Mustafa KB, Ibrahim Nb, Noraziana AW, Ayu AS, Suhaiza A, Awang M

International Medical Journal Malaysia, 2014;13(2):41-47.
MyJurnal

Introduction: To describe the sociodemographic profile, contraceptive practice, and awareness of HIV infection among unmarried post partum women in the biggest government hospital in Pahang.
Methods: A cross sectional questionnaire-proforma-based study was conducted for one year duration from August 2010 until July 2011 by identifying and recruiting all the unmarried women upon admission for delivery. Basic information were obtained from the use of patients’ case notes, and further related and necessary information were obtained from a direct face-to-face interview based on a proforma.
Results: A total of 121 unmarried women were identified and recruited. The age ranged from 13 to 36 years with a mean age of 21.6 years. 31.4% were teenagers. Only 16% of patients have tertiary education, and 2.5% never had any formal education. About one third of the women were smokers or ex-smokers, 7.5% had consumed alcohol, but none denied ever use of any recreational drugs. Almost 9% has prior history of being sexually assaulted. About three quarter of the women never used any contraceptive method. Majority of the patients (85.1%) were aware of HIV transmission risk; 75% never had any antenatal checkup or booked at late gestation (> 20 weeks); and 45.8% were not aware of any support groups for single mothers. Conclusion: Single unmarried women are associated with disadvantaged sociodemographic profile.
Contraceptive practice was also very low despite significant awareness towards risk of HIV infection. Further follow up, support and care should be offered to these women.

Matched MeSH terms: Sexual Behavior
Fulltext Predictors of sexual risk behaviour among adolescents from welfare institutions in Malaysia: a cross sectional study

Farid ND, Rus SC, Dahlui M, Al-Sadat N, Aziz NA

BMC Public Health, 2014;14 Suppl 3(Suppl 3):S9.
PMID: 25437631 DOI: 10.1186/1471-2458-14-S3-S9

BACKGROUND: In welfare institutions, it is essential to address the health-related needs of adolescent populations who often engage in sexual activities. This study examines the association between individual and interpersonal factors concerning sexual risk behaviour (SRB) among adolescents in welfare institutions in Malaysia.
METHODS: Data were derived from a cross-sectional study of 1082 adolescents in 22 welfare institutions located across Peninsular Malaysia in 2009. Using supervised self-administered questionnaires, adolescents were asked to assess their self-esteem and to complete questions on pubertal onset, substance use, family structure, family connectedness, parental monitoring, and peer pressure. SRB was measured through scoring of five items: sexual initiation, age of sexual debut, number of sexual partners, condom use, and sex with high-risk partners. Multivariate logistic regression analysis was used to examine the various predictors of sexual risk behaviour.
RESULTS: The study showed that 55.1% (95%CI = 52.0-58.2) of the total sample was observed to practice sexual risk behaviours. Smoking was the strongest predictor of SRB among male adolescents (OR = 10.3, 95%CI = 1.25-83.9). Among females, high family connectedness (OR = 3.13, 95%CI = 1.64-5.95) seemed to predict the behaviour.
CONCLUSION: There were clear gender differences in predicting SRB. Thus, a gender-specific sexual and reproductive health intervention for institutionalised adolescents is recommended.

Matched MeSH terms: Sexual Behavior/psychology*; Sexual Behavior/statistics & numerical data
High rates of unprotected anal intercourse with regular and casual partners and associated risk factors in a sample of ethnic Malay men who have sex with men (MSM) in Penang, Malaysia

Lim SH, Bazazi AR, Sim C, Choo M, Altice FL, Kamarulzaman A

Sex Transm Infect, 2013 Dec;89(8):642-9.
PMID: 23787168 DOI: 10.1136/sextrans-2012-050995

OBJECTIVE: To assess the prevalence of unprotected anal intercourse (UAI) and its correlates among ethnic Malay men who have sex with men (MSM).
METHODS: In 2010, a convenience sample of 350 MSM in Penang were recruited to participate in an anonymous, computerised survey with rapid HIV testing. Participants who were not of Malay ethnicity (n=44) or who did not report sex with another man in the previous 12 months (n=22) were excluded, resulting in 284 participants in the final analysis. Correlates of UAI were examined separately for regular and casual partnerships using bivariate and multivariate logistic regression.
RESULTS: Four men (1.9%) tested HIV positive. In the past 12 months, 64.7% of participants had regular sexual partners, 77.1% had casual sexual partners and 41.9% had both. Most participants (83.1%) reported UAI, which was more common in regular partnerships. Over two-thirds of participants had never been tested for HIV. In multivariate analysis, agreement about sexual risk reduction practices was associated with a reduction in UAI with regular partners (adjusted OR (AOR)=0.14, 95% CI 0.05 to 0.40). Reporting difficulty in using condoms was associated with an increase in UAI with casual partners (AOR=9.07, 95% CI 3.35 to 24.5), and any exposure to HIV prevention was associated with a decrease in UAI with casual partners (AOR=0.22, 95% CI 0.09 to 0.54).
CONCLUSIONS: Despite highly prevalent HIV risk behaviours, HIV seropositivity and prior HIV testing were low. Increasing sexual negotiation skills and access to HIV testing and other prevention services may improve future prevention efforts.
KEYWORDS: HIV; Homosexuality; Prevention; Sexual Behaviour

Matched MeSH terms: Sexual Behavior/psychology; Sexual Behavior/statistics & numerical data*
Fulltext Determinants of sexual intercourse initiation among incarcerated adolescents: a mixed-method study

Nik Farid ND, Che' Rus S, Dahlui M, Al-Sadat N

Singapore Med J, 2013 Dec;54(12):695-701.
PMID: 24356756

INTRODUCTION: This study aimed to investigate the determinants of sexual intercourse initiation among incarcerated adolescents aged 12-19 years in Malaysia.

METHODS: This was a sequential mixed-method research project that was conducted in two phases. Quantitative and qualitative methods were used in the first and second phases, respectively. Data was collected via a survey using self-reported questionnaires from 1,082 adolescents, and from in-depth interviews and the written essays of 29 participants. The participants were recruited from 22 welfare institutions in peninsular Malaysia.

RESULTS: Among the study participants, 483 were male and 599 were female. Overall, 62.3% of the incarcerated adolescents had initiated sexual intercourse at least once. The mean age at first sexual intercourse for both genders was 14.0 years. Individual factors found to be associated with previous sexual intercourse were the female gender (odds ratio [OR] 1.75; 95% confidence interval [CI] 1.11-2.74), previous alcohol use (OR 1.80; 95% CI 1.10-2.94), previous illicit drug use (OR 1.85; 95% CI 1.07-3.22), permissive attitude toward premarital sex (OR 4.34; 95% CI 2.17-8.70), and sexual abuse during childhood (OR 5.41; 95% CI 3.52-8.32). Qualitative findings revealed that the reasons for initiation of sexual intercourse among these adolescents were partner influence, inability to control sex drive, family issues, and the perception of sex as an expression of love.

CONCLUSION: The determinants of sexual intercourse initiation among incarcerated Malaysian adolescents are comparable to those of developed countries. However, in Malaysia, sexual and reproductive health programmes for such adolescents should be tailored to address their specific needs.

Matched MeSH terms: Sexual Behavior*
Fulltext Substance abuse and the HIV situation in Malaysia

Singh D, Chawarski MC, Schottenfeld R, Vicknasingam B

J Food Drug Anal, 2013 Dec;21(4):S46-S51.
PMID: 25278737 DOI: 10.1016/j.jfda.2013.09.033

Heroin continues to be the main drug used in Malaysia, while amphetamine-type stimulants (ATS) have been recently identified as a growing problem. A cumulative total of 300,241 drug users were detected between 1988 and 2006. It is also estimated that Malaysia has 170,000 injecting drug users. HIV prevalence among drug users in the country ranges from 25% to 45%. Currently, there are approximately 380 general medical practice offices that offer agonist maintenance treatments for approximately 10,000 patients. There are 27,756 active patients in 333 general medical practice offices and government-run methadone maintenance treatment (MMT) centers. The Needle Syringe Exchange Program (NSEP) reached out to 34,244 injection drug users (IDUs) in 2011. In the last 2 years (2011 and 2012) the number of detected drug addicts decreased from 11,194 to 9015. The arrests made by the police related to opiate and cannabis use increased from 41,363 to 63,466 between the years 2008 and 2010, but decreased since 2010. An almost four-fold increase in the number of ATS and ketamine users was detected from 2006 (21,653 users) 2012 (76,812). Between 2004 and 2010, the yearly seizures for heroin ranged between 156 to 270 kg. However, in 2010 and 2011, heroin seizures showed a significant increase of 445kg and 410.02 kg, respectively. There has been a seizure of between 600 to 1000kg of syabu yearly from 2009 to 2012. Similar to heroin, increased seizures for Yaba have also been observed over the last 2 years. A significant increase has also been recorded for the seizures of ecstasy pills from 2011 (47,761 pills) to 2012 (634,573 pills). The cumulative number of reported HIV infections since 1986 is 94,841. In 2011, sexual activity superseded injection drug use as the main transmission factor for the epidemic. HIV in the country mainly involves males, as they constitute 90% of cumulative HIV cases and a majority of those individuals are IDUs. However, HIV infection trends are shifting from males to females. There are 37,306 people living with HIV (PLHIV) who are eligible for treatment, and 14,002 PLHIV were receiving antiretroviral treatment (ART) in 2011. The decreasing trend of heroin users who have been detected and arrested could be due to the introduction of medical treatments and harm reduction approaches for drug users, resulting in fewer drug users being arrested. However, we are unable to say with certainty why there has been an increase in heroin seizures in the country. There has been an increasing trend in both ATS users and seizures. A new trend of co-occurring opiate dependence and ATS underscores the need to develop and implement effective treatments for ATS, co-occurring opiate and ATS, and polysubstance abuse disorders. The low numbers of NSEP clients being tested for HIV underscores our caution in interpreting the decline of HIV infections among drug users and the importance of focusing on providing education, prevention, treatment, and outreach to those who are not in treatment.

Matched MeSH terms: Sexual Behavior
Fulltext The impact of mild cognitive impairment on sexual activity

Momtaz YA, Hamid TA, Ibrahim R

Am J Alzheimers Dis Other Demen, 2013 Dec;28(8):759-62.
PMID: 24085247 DOI: 10.1177/1533317513504612

OBJECTIVE: The aim of this study was to identify the unique impact of mild cognitive impairment (MCI) on sexual activity among older adults.
METHODS: Data for the study were drawn from a national survey entitled the "Determinants of Wellness among Older Malaysians: A Health Promotion Perspective" conducted in 2010.
RESULTS: According to the Mini-Mental State Examination education-adjusted cutoff points, 15.6% of the 1046 respondents were identified as having MCI. Older adults with MCI had a significantly lower level of sexual activity than the healthy cognitive group (chi-square = 50.20, P < .001, 32.5% vs 62.3%). The results of 3-step hierarchical logistic regression model revealed that MCI is significantly associated with decreased sexual activity in community-dwelling older adults, over and beyond demographic factors, and age-related medical conditions affecting sexual activity (odds ratio 0.33, P < .001, 95% confidence interval 0.23-0.49).
CONCLUSION: Findings from the present study support the significant role of cognitive functioning to perform sexual activity in later life.

Matched MeSH terms: Sexual Behavior/statistics & numerical data*
Growth and reproductive performance of sambar deer in Sabal Forest Reserve of Sarawak, Malaysia

Dahlan I, Dawend J

Trop Anim Health Prod, 2013 Oct;45(7):1469-76.
PMID: 23475732 DOI: 10.1007/s11250-013-0383-6

We examined the growth, reproduction, rutting behavior, and health status of sambar deer (Cervus unicolor brookei) in secondary Acacia mangium plantation. The data were collected over 11 years from a breeding herd of 21 stags and 33 hinds in Sabal Forest Reserve, Sarawak, Malaysia. Brody's growth model of the pooled data is Y t = 148.56 (1 - 0.98e(-0.023t)), which estimates that maximum weights of adults are 184 and 115 kg for males and females respectively. Sambar deer are nonseasonal breeders with the breeding peak in February. Although the earliest age at which a female reached sexual maturity was 11 months, the mean age was 23 ± 7 months. Mean age of first fawning was 32 ± 8 months. Mean gestation period was 259 ± 12 days (n = 82). Stags shed antlers mostly between March and July. Velvet hardens at 103 ± 27 days (n = 23), and velvet harvesting is best at 7-9 weeks when antler length is 25-30 cm. Sambar deer are suitable as a farm species in forest plantations and have a vast potential to uplift rural living standards.

Matched MeSH terms: Sexual Behavior, Animal*
Malaysia makes progress against HIV, but challenges remain

Barmania S

Lancet, 2013 Jun 15;381(9883):2070-1.
PMID: 23776960
Matched MeSH terms: Sexual Behavior
Knowledge and attitude on sex among medical students of a Malaysian university: a comparison study

Sidi H, Loh SF, Mahadevan R, Puteh SE, Musa R, Wong CY, et al.

Asia Pac Psychiatry, 2013 Apr;5 Suppl 1:103-9.
PMID: 23857845 DOI: 10.1111/appy.12053

INTRODUCTION: The objective of this study was to determine the relationship between clinical/socio-demographic factors with knowledge and attitude on sex among medical students of the National University of Malaysia (UKM).
METHODS: A cross-sectional study assessing 452 students using a self-administered questionnaire of knowledge and attitude was performed and had a response rate of 80%.
RESULTS: The majority of respondents were Malays (56%), females (57.5%), lived in urban areas (66.4%), had a median family income of RM3000 and perceived themselves as moderately religious (60%). The overall score on knowledge about sex was 21.7 of 35 (a higher score indicates better knowledge about sex). It was noted that 73.2% of students felt that they did not receive adequate training in medical school to deal with patients' sexuality and sexual problems, while 51.5% felt uncomfortable talking to patients about these issues. Students in the clinical year were more knowledgeable than those in pre-clinical years (22.67 versus 20.71, P 22 marks [median score]).
DISCUSSION: The students' attitude on sex was considered conservative as the majority of them disagreed on premarital sex, masturbation, abortion, homosexuality and oral sex. Gender and religiosity have a large influence on attitudes on controversial sexual issues, whereas clinical status plays a small role. Knowledge on sex among UKM medical students is inadequate and their attitudes on sex are considered conservative. Integration of sexual medicine and health modules in the medical curriculum is crucial for students to more effectively address patients' sexual problems and promote non-judgmental attitudes towards patients.
KEYWORDS: attitude; knowledge; medical student; sex

Matched MeSH terms: Sexual Behavior/psychology*; Sexual Behavior/statistics & numerical data
Sexual desire disorder in female healthcare personnel in Malaysia

Grewal GS, Gill JS, Sidi H, Gurpreet K, Jambunathan ST, Suffee NJ

Asia Pac Psychiatry, 2013 Apr;5 Suppl 1:14-20.
PMID: 23857832 DOI: 10.1111/appy.12037

INTRODUCTION: The aim of this study was to determine the prevalence and risk factors for female sexual desire disorder (FSDD) among healthcare personnel at selected healthcare facilities in Malaysia.
METHODS: Two hundred and one female healthcare workers from three large tertiary hospitals were selected by stratified random sampling to participate in this cross-sectional study. Validated questionnaires were used to assess depression, anxiety, and sexual function in women and erectile dysfunction (ED) in their partners.
RESULTS: The prevalence of FSDD was 18.9%. Women with low sexual desire were more likely to have higher educational attainment (OR = 3.06; 95% CI; 1.22-7.66), lower frequency of sexual intercourse (OR = 12.81; 95% CI; 4.43-37.83), two or more children (OR = 3.05; 95% CI; 1.02-9.09), duration of marriage of 20 years or more (OR = 2.62; 95% CI; 1.27-5.40), and a spouse with ED (OR = 2.86; 95% CI; 1.08-7.56).
DISCUSSION: FSDD is common among female healthcare personnel in Malaysia, affecting nearly one in five women. The implication of low sexual desire is important in terms of contributing to a meaningful sexual relationship, and indirectly affects the quality of life of the healthcare personnel.
KEYWORDS: Malaysia; healthcare personnel; prevalence; risk factor; sexual desire disorder

Matched MeSH terms: Sexual Behavior/statistics & numerical data
Phases of female sexual response cycle among Malaysian women with infertility: a factor analysis study

Seen Heng Y, Sidi H, Nik Jaafar NR, Razali R, Ram H

Asia Pac Psychiatry, 2013 Apr;5 Suppl 1:50-4.
PMID: 23857837 DOI: 10.1111/appy.12044

This cross-sectional study aimed to determine the construct of the phases of the female sexual response cycle (SRC) among women attending an infertility clinic in a Malaysian tertiary center.

Matched MeSH terms: Sexual Behavior/psychology*; Sexual Behavior/statistics & numerical data
Protective effect of honey against cigarette smoke induced-impaired sexual behavior and fertility of male rats

Mohamed M, Sulaiman SA, Sirajudeen KN

Toxicol Ind Health, 2013 Apr;29(3):264-71.
PMID: 22275383 DOI: 10.1177/0748233711432568

Cigarette smoking is associated with sexual dysfunction and impaired fertility in males. The aim of this study was to determine the potential protective effect of honey against the toxic effect of cigarette smoke (CS) on sexual behavior and fertility of male rats. Thirty-two adult Sprague-Dawley rats were randomly divided into four groups (8 rats/group) as control, honey (H), CS and H plus CS (H + CS) groups. Rats in control and CS groups received oral administration of distilled water daily while rats in H and H + CS groups received honey (1.2 g/kg body weight/day) by oral gavage. Rats in CS and H + CS groups were also exposed to CS for 8 min 3 times/day. From 10 to 13 weeks of treatment, each male rat was cohabited with 3 untreated female rats for sexual behavioral and reproductive performance studies. Honey significantly increased the percentages of rats achieving intromission and ejaculation as well as increased mating and fertility indexes of male rats exposed to CS. Thus, honey has a protective effect against CS-induced impaired sexual behavior and fertility in male rats.

Matched MeSH terms: Sexual Behavior/drug effects*
Mating compatibility and competitiveness of transgenic and wild type Aedes aegypti (L.) under contained semi-field conditions

Lee HL, Vasan S, Ahmad NW, Idris I, Hanum N, Selvi S, et al.

Transgenic Res, 2013 Feb;22(1):47-57.
PMID: 22700207 DOI: 10.1007/s11248-012-9625-z

We conducted the world's first experiments under semi-field conditions (ACL-2 field house) to assess the mating competitiveness of genetically sterile RIDL male mosquitoes (513A strain). The field house is a state-of-the-art, fully-contained trial facility, simulating the living space for a household of 2-4 people in Peninsular Malaysia. Ten genetically sterile RIDL male A. aegypti mosquitoes competed with ten wild type males inside this field house to mate with ten wild type females. Hatched larvae from mated females were screened under a fluorescent microscope for genetic markers to determine if they were fathered by RIDL male or wild type male, and all results were cross-checked by PCR. Two such experiments were conducted, each repeated sufficient number of times. All strains were on a Malaysian lab strain background for the first experiment, while the RIDL males alone were on a recently-colonised Mexican strain background for the second experiment. A total of 52 % of the matings were with RIDL males in the first experiment, while 45 % of the matings were with RIDL (Mexican) males in the second experiment. Statistically, this is not significantly different from 50 % of the matings expected to take place with RIDL males if the latter were as competitive as that of the wild type males. This shows that A. aegypti RIDL-513A has excellent mating competitiveness under semi-field conditions, verifying earlier trends obtained in small lab cages. We also observed high mating compatibility between recently-colonised Mexican RIDL males and lab-reared Malaysian wild type females.

Matched MeSH terms: Sexual Behavior, Animal/physiology

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