COVID-19 cases are increasing again in India and other nations across the globe . This dangerous trend comes while hospitalizations and deaths are increasing, especially among younger populations. Medical experts say we have reached the ‘fourth wave’ of the pandemic. Although people of all ages are vulnerable to COVID-19, the most recent wave seems to be impacting younger people more than others and experts believe these variants are causing more severe infections raising hospitalization rates and ultimately, deaths. The virus continues to spread as more people let their guard down by not wearing masks, keeping physical distance, etc. Even if you are fully vaccinated. Why effective is the vaccine in preventing the spread of Covid-19 ?