ABSTRACT
In vitro killing activity of peracetic acid (Perasafe) at a concentration of 0.26 per cent w/v was tested against Escherichia coli, Enterobacter cloacae, Klebsiella pneumoniae, Pseudomonas aeruginosa, Salmonella typhi, Salmonella paratyphi A, Acinetobacter baumannii, Sternotrophomonas maltophilia, Enterococcus faecium, Enterococcus faecalis, methicillin-resistant Staphylococcus aureus (MRSA), Bacillus subtilis spore, Mycobacterium tuberculosis and human immuno-deficiency virus type I. Exposure to Peracetic acid (0.26% w/v) for 10 minutes resulted in massive killing of all the aforementioned organisms and spore.
Subject(s)
Bacteria/drug effects , HIV-1/drug effects , Mycobacterium tuberculosis/drug effects , Peracetic Acid/pharmacology , Spores, Bacterial/drug effectsABSTRACT
Vertical transmission of HIV-1 is caused by multifactorial factors. To access the relationship of viral factors involving in perinatal transmission of HIV-1 subtype E, which is the predominant type in Thailand, plasma viral load, blood CD4+ lymphocyte level, heteroduplex mobility, and V3 sequence of the HIV-1 envelope gene were studied in 32 transmitting and 25 non-transmitting mothers. We found that HIV-1 subtype E vertical transmission was strongly associated with high maternal plasma viral RNA (> 4 x 10(4) copies/ml) and high genetic diversity of envelope gene determined by heteroduplex mobility (< 0.9). The variation of nucleotide sequences in envelope gene of subtype E vertical transmission could not determine in V3 region. Hence, plasma viral load and heteroduplex mobility can be used as prediction factors in vertical transmission of HIV-1 subtype E.
Subject(s)
Adolescent , Adult , Amino Acid Sequence , DNA Primers , Female , HIV Infections/transmission , HIV-1/isolation & purification , Humans , Infant , Infant, Newborn , Infectious Disease Transmission, Vertical , Molecular Sequence Data , Polymerase Chain Reaction , Pregnancy , RNA, Viral/blood , Thailand , Viral LoadABSTRACT
Nested polymerase chain reaction (nested PCR) was used to separately amplify part of gag, pol, and env genes of human immunodeficiency virus type 1 (HIV-1) to evaluate that primer specific to either gag (SK380/390&SK38/39), pol (JA17/18&JA19/20), or env (JA9/10&JA11/12) genes is suitable for HIV-1 PCR based diagnosis in Thailand. The positive PCR results in 70 HIV-1 infected adults are 100, 97, 89 per cent and in 75 HIV-1 infected infants are 100, 94, 74 per cent by gag, pol, env primer, respectively. The specificity of all three primer sets is 100 per cent. The unamplified samples by pol and env primers were identified as HIV-1 subtype E by PELISA method. False negative in HIV-1 PCR based diagnosis caused by high genetic variation of HIV-1 can be overcome by using several primer sets as shown in this study.