Evaluation of immunogenicity, safety and persistence of the subjects with HIV infected received the third dose of inactivated COVID-19 vaccine .

The subjects aged ≥18 years with HIV infected who have completed the schedule of two doses for 3 months recruited to receive a third dose of inactivated COVID-19 vaccine.

Blood samples will be collected 3 times: before the third dose of vaccinatioin，28 days and 6 months after the third dose of vaccination.

Any local or systemic adverse events that occurred within 21 days after vaccination will be recorded.

Inclusion Criteria:

• Subjects aged ≥18.
• Body temperature < 37.3 ° C confirmed by clinical examination before enrollment .
• Subjects who meet the diagnostic criteria for HIV infection and AIDS.
• CD4+ count is less than 500/ul and more than 50/ul .
• Female subjects of reproductive age declare that they are not pregnant, have no birth plan in the first 3 months after enrollment, and have taken effective contraceptive measures in the first 2 weeks before enrollment.
• Able and willing to complete the entire study plan during the study follow-up period.
• Have the ability to understand the study procedures, voluntarily sign informed consent, and comply with the requirements of the clinical study protocol.
• Subjects participating in the past clinical trial have completed two doses of COVID-19 vaccine and blood collection before and after immunization;

Exclusion Criteria:

• Subjects were previously confirmed cases of COVID-19 or asymptomatic infected persons.
• Being allergic to any component of vaccines (including excipients) .
• Subjects who have experienced severe allergic reactions to vaccines (e.g. acute anaphylaxis, urticaria, angoneeurotic edema, dyspnea, etc.).
• Having uncontrolled epilepsy and other progressive neurological disorders and a history of Guillain-Barre syndrome.
• Injection of non-specific immunoglobulin within 1 month before enrollment.
• Pregnant and lactating women.
• The subjects are suffering from an acute illness; Or thrombocytopenia patients with platelet count < 20×10^9/L within three days before inoculation, that is, patients at high risk of spontaneous bleeding.
• Acute HIV infection and opportunistic infection.
• Subjects with co-opportunistic infections who did not receive antiviral therapy.
• Subjects with CD4+ count less than 50/ul who have not received antiviral therapy.
• HIV-infected subjects undergoing treatment with severe drug interactions and overlapping toxicity (kidney damage, liver damage, hematological problems, etc.).
• Patients with malignant tumors are undergoing chemotherapy and radiotherapy before and after surgery.
• Subjects who had vaccine-related adverse reactions after the second dose.
• Having high fever (axillary temperature ≥39.0℃) for three days after the second dose of inoculation, or severe allergic reaction.
• Having any adverse nervous system reaction after the second dose.
• Other subjects whose physical conditions, as determined by the investigator, are not suitable for inclusion in clinical studies.