While the ‘breakthrough’ Covid-19 cases raise questions about the efficacy of vaccines, especially against the highly contagious Delta variant, health experts have said that they are not a cause for alarm. What are breakthrough cases? Why do breakthrough cases occur? The US Centers for Disease Control and Prevention (CDC) has said that vaccine breakthrough cases are expected since no vaccines are 100% effective. While the current data, as per the CDC, suggest that Pfizer and Moderna vaccines offer protection against most variants, however, they will cause some vaccine breakthrough cases.

Source: Hindustan Times July 22, 2021 16:52 UTC