Part 8/13:

The emergence of variants like Delta has tested the effectiveness of existing vaccines. Data suggests that while all vaccines show reduced efficacy against some variants, they still provide strong protection against severe illness.

In Indonesia, for example, there were reports of healthcare workers vaccinated with Sinovac developing COVID-19 with severe symptoms or even facial paralysis. Experts hypothesize for these breakthroughs that waning immunity and the highly transmissible Delta variant contribute to reduced vaccine effectiveness and highlight the importance of booster shots.