Our expert says:
Researcher, you will have to define what you mean with a weak immune system, but in general it happens as soon as the immune system is exposed to the virus. The problem comes in with trying to detect these antibodies. A PCR is more than 90% sensitive after 5 days and will give a definite result after 14 days. 4th generation ELISA tests are positive within 3-4 weeks and a follow up after 3-6 months will give a definite result. Good luck.
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