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polet [3.4K]
3 years ago
13

Why is a second blood test necessary three months after a person thinks he or she has been exposed to hiv?

Biology
2 answers:
stepan [7]3 years ago
7 0
It takes 3 months for antibodies
Elza [17]3 years ago
6 0
The antibodies to the HIV virus may take up to three months to appear in the blood of the infected person. 
Therefore, the second blood test is necessary three months after a person thinks that he/she has been exposed to HIV to check the presence of these antibodies and confirm whether the person is infected or not.
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the first cells likely to encounter a pathogen, such as phagocytes, are professional antigen presenting cells (apcs). this means
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Professional antigen-presenting cells, such as phagocytes, are the first cells to encounter a pathogen (apcs). This means they have the ability to activate cells of the adaptive immune system.

<h3>What is meant by Pathogen?</h3>
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Therefore the correct option is D)  can activate cells of the adaptive immune system.

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8 0
11 months ago
What steps are involved in creating a hydroelectric power plant
anzhelika [568]
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