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6 members of one family have breakthrough COVID-19 infections, say they're glad they're vaccinated

A medical expert says six cases in one family is unusual. Family members think the transmission happened at an outdoor concert.

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Six adult members of the same family in New Hampshire are in quarantine after testing positive for COVID-19 despite all of them being fully vaccinated, but they say they're still glad they got the vaccine.

Daniel Hoúlne, 71, and his 68-year-old wife both have flu-like symptoms.

"We all had Pfizer, except for one of my son in-laws," Hoúlne said. "He had Moderna."

Hoúlne said he's thankful his symptoms are mild. He said he's certain that without the vaccine, he would be in the hospital now.

"The really important thing is that those that are developing breakthrough infections are mostly developing mild illness and not requiring hospitalization," said Dr. Michael Calderwood, of Dartmouth-Hitchcock Medical Center.

Calderwood said nearly all cases of COVID-19 across the country right now are caused by the delta variant of the virus. In New Hampshire between the end of January and last week, about 3% of cases have been breakthroughs.

Calderwood said six cases in one family is unusual. Family members think the transmission happened at an outdoor concert that both of Hoúlne's adult daughters and their husbands attended.

"There was a requirement for people who attended the concert to be vaccinated or have a negative COVID test within 72 hours of going to the concert," Hoúlne said.

The Department of Health and Human Services is tracking breakthrough infection by vaccine brand.

Pfizer has 752 infections out of 374,252 vaccinated people, Moderna has 465 infections out of 285,792 and Johnson & Johnson has 219 infections out of 55,009 vaccinated people in New Hampshire.

"There is also discussion around whether the vaccines we are using are less effective against the delta variant than the variants that were present earlier during the pandemic," Calderwood said.