Coronavirus disease 2019 (COVID-19) is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was identified in Wuhan, China, in December 2019. The disease has since spread worldwide, leading to an ongoing pandemic.[1] https://en.wikipedia.org/wiki/COVID-19 Preventive measures include physical or social distancing, quarantining, ventilation of indoor spaces, covering coughs and sneezes, hand washing, and keeping unwashed hands away from the face, mouth , nose and eyes. The use of face masks or coverings has been recommended in public settings to minimise the risk of transmissions. Several vaccines have been developed and many countries have initiated mass vaccination campaigns.
How long does it take to have immunity after vaccination?
Pfizer and Moderna COVID-19 vaccines require 2 doses, Johnson & Johnson /Janssen vaccine requires only one. With all three vaccines, immunity builds over a few weeks after immunization. Data from Johnson & Johnson show that most vaccinated trial participants had a robust immune response 15 days after getting the shot, with significant protection reached by day 29.[2] https://www.nejm.org/doi/full/10.1056/NEJMoa2034201
- Pfizer: 1 week after vaccination[3]https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/Pfizer-BioNTech.html
- Moderna: 2 week after vaccination[4]https://www.cdc.gov/vaccines/covid-19/info-by-product/moderna/index.html
- Johnson & Johnson: 29 days after vaccination[5]https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/janssen.html
You can find detailed COVID-19 vaccine information below.
| How long does it take to build immunity after getting the COVID-19 vaccine? | PFIZER | MODERNA | JOHNSON & JOHNSON / JANSSEN |
|---|---|---|---|
| Type of vaccine | mRNA | mRNA | Adenovirus-based non-replicating viral vector |
| Overall efficacy for current variants | 95% | 94.10% | 72% in the USA |
| Time needed to build immunity | 7 days after vaccination | 14 days after vaccination | 29 days after vaccination |
| Protection from severe disease | 90% | 100% | 85% |
| Number of study subjects hospitalized from COVID-19 | 0 | 0 | 0 |
| Plans for variants if efficacy drops | Booster in development | Booster in development | Booster in development |
| Approved for ages | 16+ | 18+ | 18+ |
| Number of required doses | 2 | 2 | 1 |
| Dose intervals | 3 weeks apart (21 days) | 4 weeks apart (28 days) | N/A |
| Storage information | -25° to -15° C | -25° to -15° C | 2° to 8° C |
| Pediatric approval | Currently in trials (Trials fully enrolled | Currently in trials (Trials fully enrolled) | Currently in trials |
| Pregnancy approval | DART complete, no adverse reactions, human trials open | DART complete, no adverse reactions | – |