Immunity against COVID-19 after one year of coronavirus infection
Dr. Takeharu Yamanaka, professor of Yokohama City University reported that 96% of people who infected COVID-19 with mild symptom had immunity after one year. It was droped 1% from the people who have immunity after 6 month.
Most of people who infected COVID-19, did't lose its antibody against coronavirus.
Dr. Yamanaka also mentioned the difference depend on severity of the symptom.
100% of people, who have had moderate or severe symptoms, had immunity after one year.
| NO/mild symptom | moderate symptom | severe symptom |
| 96% | 100% | 100% |
Immunity against the each mutations after one year of coronavirus infection, it went lower the number of people who have antibody against those. But, still many people have immunity, if once infected COVID-19.
Against alpha (UK) coronavirus mutation
| NO/mild symptom | moderate symptom | severe symptom |
| 79% | 98% | 95% |
Against beta (South africa) coronavirus mutation
| NO/mild symptom | moderate symptom | severe symptom |
| 69% | 90% | 95% |
Against gamma (Brazil) coronavirus mutation
| NO/mild symptom | moderate symptom | severe symptom |
| 76% | 96% | 95% |
Against delta (India) coronavirus mutation
| NO/mild symptom | moderate symptom | severe symptom |
| 69% | 92% | 95% |
It would be corresponded with post-vaccination, and the research group continue studying immunity after vaccination.
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