evidence: - Can the COVID-19 vaccine cause Vaccine-Acquired Immune Deficiency Syndrome (VAIDS)? [...] - Does the COVID-19 vaccine impact fertility? As with many medicines, some studies show some women experience small, temporary menstrual cycle changes following COVID-19 vaccination. There is no evidence that the vaccine causes infertility.12 - If the COVID-19 vaccine is effective, why do I need additional shots?