HIV PCR test provides more accurate results and sensitive

The latest statistics show WHO issued about 2.3 million people in India are infected with HIV. The country has also suffered fourth in the world's largest population of AIDS. The good news is that HIV rates in India have fallen sharply, dropping more than 3 million in just two years. This reduction of the virus due largely to more widespread use of tests and testing for more accurate and earlier, such as HIV-PCR.

Earlier this month, "The Times of India" published an article entitled "DK dist shows a decline in HIV," DK stands for Dakshina Kannada. With a prevalence of Dakshina Kannada district operates 0.75% higher than the national average of 0.69%, but "all in 1245 positive [HIV] cases were detected in 2007, this year it was only 815 to the end of October. "Unfortunately, 5% of these cases in 2010, pregnant women without HIV treatment, which will probably pass the virus to her baby.

Fortunately ", nevirapine (a drug used for HIV infection) therapy has seen in pregnant women, the reduction of cases of mother to child transmission, dramatically." Administered to the mother and the child within 72 hours of birth, the use of nevirapine, when the child reaches the age of six weeks with DNA by PCR (HIV-1 PCR) to detect the infection followed. Positive or negative, to mark 18 months, HIV antibody (HIV-1 Abs) test is then performed to confirm the initial results.

Why HIV PCR test is the first course of action? Because it is much more sensitive than other tests for HIV. Instead of looking for the HIV antibody, it looks directly for pro-viral DNA. Because of its complexity, the HIV-1 test by PCR 99% accurate at 28 days or more a suspected exposure or contact. It is this sensitivity, the PCR test format chosen by the industry in high-risk occupations and situations, including when children are born HIV-positive mothers. Moreover, to recognize this test for the presence of HIV before seroconversion, when the virus is much more tractable, and the possibility of a cure is still there.

Today, the same ultra-sensitive HIV-PCR at high risk countries such as India trust their babies with AIDS in the health of the general population of the United States has been named, reliable results, accurate and fast. The national leader in direct sales, laboratory tests, with two of the largest laboratories in the nation for all the HIV-1 PCR test results for patients in two to five business days to make. And combined, however the Indian scenario, a child ordering this test and treatment for HIV PCR testing of HIV-1 antibody for confirmation of the results.

Abbreviation for Polymerase Chain Reaction examined, the PCR of DNA to find the only son of the HIV virus. And because it is a direct test for the presence of HIV DNA, it takes the DNA of the AIDS virus in the blood of an infected person much more sensitive and more accurate than the conventional ELISA.

Accuracy of DNA paternity tests


There are two main methods that can be used for DNA paternity tests, including PCR (Polymerase Chain Reaction) and RFLP (Restriction Fragment Length Polymorphism). In this article we consider these two methods, the difference is and how they work.

Polymerase Chain Reaction test usually involves taking a swab from inside the cheek for DNA samples. It is faster than RFLP testing and especially look between six and nine loci on the DNA. This test does not give the same level of information provided by the RFLP test.

PCR-DNA test works by "strengthening" of the DNA sample, or take a small DNA sample and then multiplying. This is useful if only a small sample can be obtained and is also useful when working with degraded DNA. When using DNA testing by PCR, however, the laboratory must be particularly careful about preventing pollution in the sample if the amplification process might tend to increase the risk of contamination.

The process of DNA testing by PCR is to heat the DNA, the addition of primers and then recombines it to cool and an enzyme reads the DNA sequence of multiple copies of DNA to create.

The restriction fragment length polymorphism tests is longer than the PCR test and is an old method, but can provide more reliable results, each locus contains more information about paternity. It requires a larger sample of DNA and is more likely to use the blood for DNA testing, but it can also be done using a buffer inside the cheek, if necessary.

The AABB 2004 report said that there was a decrease in the number of laboratories using the RFLP method and an increase in laboratory using PCR DNA testing and PCR is used in 98.34% of cases.

Finally, there are two main methods of DNA paternity tests primarily used today. Both methods are testing gene amplification and restriction fragment length polymorphism testing. PCR is used in 98.34% of cases, DNA tests based on the 2004 AABB and appears to increase over the old method of RFLP. PCR is a faster method of testing and increases the amount of material DNA, so that only small samples are needed, but this leads to a risk of infection. If you opt for a PCR test or order a DNA test kit at home, make sure they are approved by the AABB and they offer a guarantee of at least 99% and test at least ten loci .

The Polymerase Chain Reaction

The polymerase chain reaction (PCR) is a process for building very small amounts of DNA so that they can be viewed and evaluated or used in other scientific methods. PCR is widely used in almost all branches of biology, including molecular biology, microbiology, genetics, environmental sciences, food science, biotechnology, forensics and clinical diagnostics. The PCR technique involves using a DNA polymerase enzyme to improve (duplicated several times) a piece of DNA. The original molecule of DNA is copied by the enzyme DNA polymerase, effectively doubling the number of DNA molecules.

Then each of these molecules is duplicated in a second replication cycle, resulting in four molecules. Again, each of these molecules are duplicated by the third enzyme replication cycle. The process is called a chain - hence the name. "Polymerase chain reaction" The original piece of DNA is amplified over many cycles, generating millions of copies of the original DNA molecule often the PCR experiment is simply out of presence. or absence of a specific type of DNA to check, but sometimes also used the PCR to provide sufficient DNA for use in a subsequent experiment to generate a clone or DNA sequencing. The original PCR process was adapted to an expanding range of genetic, diagnostic tests, and many other applications to run.

Modern variants of PCR include real-time PCR. This technology allows the newly generated DNA molecules to be tested immediately they are produced. This ability to process real-time PCR, while the reaction still occurs, is of great use to scientists because it reduces the amount of time required for a result (particularly important in the clinical diagnosis) and allows generation also the quantification of DNA. Real-time PCR can not only answer the question "what is this DNA?" but "how much DNA is present?".