There are two types
HIV:HIV-1 and HIV-2, their main difference is that on the envelope glycoprotein.
HIV Is a strong variation of the virus, varies between different strains, or even the same strain in the same body can change in just a few months,
Original and effectiveness in neutralizing antibody to lose, which created great difficulties for HIV vaccine development.
Current HIV-1 strains of the global epidemic hasappeared in three groups, namely, m,
O and group n, where m can be divided into A to j 10 subtypes and inter–subtype recombinants have been found.
HIV-2 a to f 6 Subtypes. Now some scholars on the basis of the biological characteristics of the virus HIV-1 grouping, according to the virus and the host cell with the use of auxiliarydifferent receptors (CCR5 and CXCR4), divided into R5 and
X4 strains; or under host range and copy the feature, are divided into non-syncytium inducing strains (NSl) and syncytium inducing strains (S1), toxic and nontoxic strains of strain; fast/high and low/slow type. HIV on the outside lower resistance than hepatitis b virus (HBV) has a much lower resistance to outside. Sensitive to heat, dry,no acid resistance. 60~C above may be inactivated. Therefore, injection equipment,medical appliances, heat sterilized, boil or steam sterilization can be achieved ShawHIV purposes. HIV is very sensitive to chemical crystals, commonly used disinfectants such as 70% alcohol, 10% chloride, 2%, glutaraldehyde, 4% formalin-inactivated virus.
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