All information these cookies collect is aggregated and therefore anonymous. PRIMARY SERIES How can I prepare for my COVID-19 Vaccine? ADDITIONAL DOSE At least 2 months after 3rd dose or last booster, Novavax Thank you for taking the time to confirm your preferences. The Johnson & Johnson COVID-19 vaccine was linked to an increased frequency of blood clotting, so I would not recommend that vaccine. vaccines WebI have the factor V Leiden mutation (heterozygous) and had a DVT at age 25, while on the combined oral contraceptive pill. Patients on warfarin should have prothrombin time testing performed within 72 hours prior to injection to determine international normalized ratio (INR); if results are stable and within the therapeutic range, they can be vaccinated intramuscularly. The study was internally funded. [CDATA[// >