Will be tested for HIV, because this is the requirement of AIDS prevention and control, everyone who enters must be screened for HIV antibodies in order to find people who have been infected with HIV but don't know it. Zhihu Tmall saliva test does not require blood.

There are two lines on the test paper. The upper part is the quality control line, also called the control line, and the lower part is called the detection line.

When testing, if only one of the above results is negative, if both results are positive,

If only one or all of the following items are invalid, a second interview is recommended.