The chance of contracting HIV through blood transfusion is still extremely low. At present, the requirements for blood and blood products in China are very strict and need to go through multiple testing procedures, so the risk of contracting HIV through blood transfusion is still very low. Of course, there is no guarantee of 100% safety, because there is a window period for HIV infection. The so-called window period is the time when you are infected with HIV, but no antibodies have been detected yet. Therefore, it is recommended that high-risk groups should not donate blood for the purpose of testing for HIV infection.