You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is What is the best method to diagnose HIV in an infants? and explain in detail?
In children younger then 18 months of age, WHO recommended HIV DNA or RNA PCR to diagnose HIV infection, as maternal antibodies may interface with antibody detetion.
In children > 18 months of age, demonstration of IgG antibody of HIV by ELISA and western blot establishes HIV infection.