They were French Guiana's gold miners, Cape Cod revelers, and Indian health-care workers. Despite being from different countries, they had two things in common. They were all vaccinated against covid-19. They all became part of infected clusters.These cases have shown that superspreading and covid-19 transmission can occur in even groups of people who are nearly all vaccinated. This has set off alarms in health officials and destroyed hopes for a swift return to normal in the US.The CDC had advised vaccinated Americans that they could go unmasked in May 2021. However, on Tuesday, the agency changed its mind and said that masks should be worn indoors.Investigators discovered the reason from an outbreak in Provincetown (Massachusetts), a seaside community on Cape Cod that saw a rowdy parade and packed weeks of pool parties in July. Health investigators claim that there have been over 800 cases of covid-19 since then. 74% of these cases are in people who had been vaccinated.The so-called Delta variant was responsible for the Provincetown outbreak. It now accounts in large part for the majority of cases in the US. Rochelle Walensky (head of the CDC) stated that the key discovery in the Provincetown outbreak was that people who were vaccinated against the virus have the same amount of virus in their bodies as those who are not.She said that high viral loads indicate an increased risk for transmission. This raises concern that people vaccinated against delta could transmit the virus to others, unlike other variants.This recommendation calls for a swift return to a multilayered approach, including social distancing and masks, in order to prevent school reopenings from occurring next month in the US.Infection in a gold mineSince weeks, investigations have found evidence that there are outbreaks among vaccinated people all over the globe. A Paris-based scientific team and French Guiana recently reported that covid-19 ravaged a South American mine of gold in May, even though most miners had been vaccinated with Pfizers.60% of the infected became gamma-positive despite being inoculated. Scientists were so shocked by this, they decided to check if vaccines had been shipped damaged.
