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Interaction of imipenem and tigecycline against carbapenem-resistant Acinetobacter baumanii: the relativity of synergism

M.Z. Noraziah, O.Z. Siti Sarah, H. Alfizah

Sains Malaysiana, 2015;44:1061-1065.

Acinetobacter baumanii is an opportunistic bacterium that causes widespread nosocomial infections and tends to be multi-resistant to most of antibiotics. Tigecycline is a well-known antibiotic that possesses a wide-range of activities and is very active in vitro towards a variety of resistant pathogens, including A. baumanii. The aim of this study was to evaluate the effects of the imipenem and tigecycline combination against carbapenem-resistant A. baumanii (CRAB). The minimal inhibitory concentration (MIC) was determined using the E-test method. The microbroth checkerboard technique was employed to determine the effects of the imipenem and tigecycline interaction by obtaining the fractional inhibitory concentration (FIC) index value. A time kill (TK) study was performed to identify any synergistic effects when both imipenem and tigecycline were used against CRAB strains. The result demonstrated that all A. baumanni strains exhibited imipenem MIC values of 32 µg/mL. The combination of imipenem and tigecycline demonstrated an additive effect (FIC > 0.5-4) against all of the strains and synergistic activity (decrement of > 2 log10 CFU/mL) towards AC 34/07 and AC 32/06 strains. The use of imipenem in combination with tigecycline resulted in a more efficient activity and an increased capability to control CRAB infections. This effect showed potential combination and may be of importance in the development or modification of antimicrobial agents for the treatment of CRAB infections.
Fulltext Identification of genotypes of Influenza A virus in Malaysia

Mm R, Kk W, I I, Zz R, H A

Pak J Med Sci, 2014 Sep;30(5):1068-71.
PMID: 25225528 DOI: 10.12669/pjms.305.5224

OBJECTIVE: Influenza is considered as an emerging disease until today. The present study was undertaken to determine the prevalent genotypes of Influenza A virus in Malaysia.
METHODS: Influenza A virus was identified from respiratory specimens by real-time reverse transcriptase polymerase chain reaction (rRT-PCR). Phylogenetic analysis of the identified isolates was performed and genotypes were detected.
RESULTS: A total number of 505 throat swabs and nasopharyngeal aspirates were examined by rRT-PCR at Universiti Kebangsaan Malaysia Medical Centre (UKMMC) in which 65(12.87%) were positive for influenza A. The identified isolates were successfully genotyped by phylogenetic analysis. The identified influenza A genotypes were: H1N1 (42), H3N2 (20) and H5N1 (3).
CONCLUSION: The findings indicated that 3 genotypes were circulating in Malaysia during 2011 in which H1N1 was the predominant. RESULTS added new genotype (H5N1) identification record in Malaysia that may be added in data base of WHO and CDC.

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