Lifestyle Health MA Outbreak of 900 COVID Cases Leads to Only 7 Hospitalizations: 'The Vaccines Are Working' "Of the 900 cases related to the Provincetown cluster, there have been no deaths, 7 hospitalizations, and the symptoms are largely mild," said Provincetown's Town Manager By Glenn Garner Glenn Garner Instagram Twitter Glenn Garner is a Writer/Reporter who works heavily with PEOPLE's Movies and TV verticals. Since graduating from Northern Arizona University with a dual major in journalism and photography, he got his professional start at OUT Magazine, The Advocate and Teen Vogue, and he's since consistently kept his finger on the pulse of the LGBTQ community. His first book The Guncle Guide was released in 2020 and was featured on Katie Couric's list of 100 recommended books of the year. People Editorial Guidelines Published on August 1, 2021 07:33 PM Share Tweet Pin Email Photo: John Greim/LightRocket via Getty Although many of the COVID infections in last month's outbreak in Massachusetts were among the vaccinated, few people got very sick. "The vaccines are working," said Provincetown Town Manager Alex Morse in a Tweet on July 30. "Of the 900 cases related to the Provincetown cluster, there have been no deaths, 7 hospitalizations, and the symptoms are largely mild." "Our positivity peaked at 15% on 7/15 and was only 4.8% yesterday. The outbreak is contained and Provincetown is safe," he continued. Last week the Centers for Disease Control and Prevention released a study that found 346 of the 469 reported coronavirus infections at that time occurred in people who were fully vaccinated. The outbreak happened between July 3–17 in Barnstable County as large summer gatherings took place in Provincetown. Of the breakthrough cases in the report, 274 were symptomatic, while four people were hospitalized. One other infected individual who had not been vaccinated was also hospitalized. Testing found that 90% of specimens from 133 patients contained the Delta variant. The most common side effects were cough, headache, sore throat, muscle pain, and fever. No deaths were reported. When Should Vaccinated People Wear Masks? What to Know About the Latest Guidelines "This finding is concerning and was a pivotal discovery leading to CDC's updated mask recommendation," CDC Director Dr. Rochelle Walensky said in a statement. "The masking recommendation was updated to ensure the vaccinated public would not unknowingly transmit virus to others, including their unvaccinated or immunocompromised loved ones." A person getting vaccinated. Getty The CDC previously released new guidelines on Tuesday based on new science around the Delta variant, which has become the most predominant strain circulating in the United States. Appearing in four out of five infected samples, the Delta variant has been known to infect vaccinated people and spread to others on occasion. The new guidelines included the continued push for COVID-19 vaccinations, as they have been shown to reduce the spread of COVID-19, in addition to preventing severe illness, hospitalization, and death, even with the Delta variant. Vaccinated and unvaccinated people in areas with substantial-to-high transmission rates are recommended to wear masks in public indoor spaces. Additionally, those who are not inoculated are urged to continue wearing masks until they are fully vaccinated. RELATED VIDEO: Disney World Area Is in COVID 'Crisis' According to Orange County Executive Meanwhile, the CDC recommends K-12 students return to full-time in-person learning in the fall, with proper COVID precautions in place. "This moment, and most importantly, the associated illness, suffering and death, could have been avoided with higher vaccination coverage in this country," said Walensky. "COVID-19 continues to present many challenges and has exacted a tremendous toll on our nation. We continue to follow the science closely and update the guidance, should the science shift again. We must take every step we can to stop the Delta variant and end this pandemic." As information about the coronavirus pandemic rapidly changes, PEOPLE is committed to providing the most recent data in our coverage. Some of the information in this story may have changed after publication. For the latest on COVID-19, readers are encouraged to use online resources from CDC, WHO, and local public health departments and visit our coronavirus hub.