Thread by @DrEricDing

Over 500 fully vaccinated tested positive for #COVID19 in Massachusetts in <3 weeks. As of June 5, 3,641 cases among ~3.5 mil fully vaccinated in MA–likely undercount due to lower testing in vaccinated. Yet CDC stopped counting unless hospitalized/dead🧵
nbcboston.com/news/local/mor…

2) According to the U.S. Centers for Disease Control and Prevention, a total of 10,262 breakthrough infections were reported throughout the country as of April 30, at which time 101 million people had been vaccinated.

3) More cases have likely gone unreported, federal officials have said, because they only have data from 46 states and territories. Additionally, most vaccinated people don't show symptoms that are serious enough to get tested.

4) "Testing to identify current infection remains critical to control of COVID-19," Dept of Public Health said. "People with current infection can spread the virus to others and isolation of cases and identification of close contacts is a foundation of public health response."

5) In fact, the more contagious Delta COVID-19 variant, first identified in India, has been in Massachusetts for weeks now and is steadily rising. Experts say the #DeltaVariant is more contagious and associated with a higher risk of hospitalization than the original #COVID19.

6) Think the CDC wouldn’t muzzle / stop tracking most breakthrough infections? Oh yes that exactly what the CDC did starting May 1st! They suddenly changed their tracked and stopped recording breakthroughs unless you died or landed in a hospital. Bad.

nytimes.com/2021/05/25/hea…

7) “Julie Cohn was fully vaccinated when she went to cheer at her 12-year-old son’s basketball game in March. Midway through the match, he asked to remove his mask because he was getting so hot. She thought little of it.
Three days later, he had a sore throat…

8) “He tested positive for the coronavirus, as did his younger brother a few days later. Ms. Cohn cared for them, thinking she was protected, but she woke up with what seemed like a head cold on March 28. The next day, she, too, tested positive.”

9) “Earlier this year, the agency was monitoring all cases. Through the end of April, when some 101 million Americans had been vaccinated, the C.D.C. had received 10,262 reports of breakthrough infections from 46 states/territories— “a substantial undercount,” says a CDC report

10) Genomic sequencing could be done on only 555, or about 5 percent, of the reported breakthrough cases. Over half of them involved so-called variants of concern, including the B.1.1.7 and B.1.351 variants.
Some 995 people were known to have been hospitalized.

➡️stay vigilant.