COVID-19 vaccines remain effective in preventing severe cases of the disease. However, the latest data suggest that the vaccine's effectiveness decreases over time and becomes less effective in preventing the disease (or developing it with mild symptoms), especially among people 65 years of age and older.
Clinical studies showed that the booster dose increases the immune response among the observed people who have completed the vaccination period with Pfizer-BioNTech or Moderna 6 months prior or who received their single dose of J&J / Johnson vaccine two months ago.
People with the boosted immune response should have improved protection against COVID-19, including Delta strain1.
The booster dose is received by people 18 years of age and older after a full dose of COVID-19 vaccination, with priority given to those at higher risk.
The single-dose booster is given with the same or a different COVID-19 vaccine2.
2 ՀՀ Առողջապահության նախարարի հրաման՝ COVID-19-ի դեմ խթանիչ (բուստեր) դեղաչափով պատվաստումների ուղեցույցը հաստատելու մասին