Over the past two weeks, Seychelles which has been dubbed "the most vaccinated country in the world" " has seen a spike in coronavirus cases, causing alarm. The archipelago in the Indian Ocean, with a population of about 98,000, has fully vaccinated more than 60% of its population, but it's also seen its number of active COVID-19 cases nearly double over the past month. The country has closed schools and canceled activities to attempt to curb the spread. Though Seychelles has been called the world's "most vaccinated country," not all vaccines are created equal. The country used two vaccines to inoculate its population " Sinopharm, a Chinese state-owned vaccine, and Covishield, a version of the AstraZeneca vaccine, both of which have not been proven to be as effective as the Pfizer-BioNTec and Moderna vaccines. Just last week, the WHO expressed "very low confidence" in data provided by Sinopharm around its risk of severe side effects. Recent clinical trial data found the vaccine was about 78.1% effective after two doses, but the Seychelles outbreak could suggest that the efficacy is less than that. Places like Seychelles also didn't see huge COVID surges earlier in the pandemic, and have lower levels of natural immunity in their communities. Chile is another example of a country with a high vaccination rate that now is seeing a spike in COVID-19 cases. Its number of new daily cases nearly doubled in April from the prior month, even though the country has vaccinated more than 45% of its population.