TOKYO -- New coronavirus variants, such as the highly infectious delta variant, are spreading rapidly in Japan. For a vaccine to be most effective, a certain period of time beyond the second dose is necessary, and people who have received only one dose are still at high risk of being infected by a mutated strain. In my case, I (age 45) was infected with a mutated strain after receiving my first vaccination at my workplace. I suffered from a high fever and severe headaches for several days. People must remain cautious about the risk of infection when not fully vaccinated.
A 40-degree fever and splitting headaches: The delta variant up close
Nikkei reporter who contracted highly infectious strain details his experience