Singer Marina says she got COVID after being fully vaccinated, and urges people not to ignore mild symptoms

• Marina Diamandis says she contracted COVID-19 after being fully vaccinated.
• Though her symptoms were not severe, Diamandis said last week "sucked" and urged people to "be careful out there."
• Vaccinated people can still contract COVID-19, but they tend to be mild or asymptomatic cases.

Welsh singer-songwriter Marina Diamandis got sick with COVID-19 last week - even though she is fully vaccinated, she wrote on Twitter Monday.

Diamandis, who previously went by the stage name of the band Marina and the Diamonds and is now known as Marina, said five of her friends, who'd also received both shots, contracted the illness too.

The 35-year-old told her followers to "be careful out there," as the coronavirus is still circulating and vaccines - while they drastically reduce the risk of severe illness - do not eliminate the risk of infection.

"The main job of this vaccine is to prevent serious illness or death - and I'm so glad (and grateful) I have it, otherwise I wouldn't be feeling okay on day six," she wrote.

"However, it doesn't make the 'mild' version of Covid any less unpleasant," she continued. "It sucks! I definitely had a false sense of security indoors and so wanted to give you all a heads up."

Diamandis told followers to get vaccinated as soon as it's offered to prevent an "even worse" bout of COVID-19.

COVID-19 symptoms among the vaccinated tend to be mild

She said sneezing and sore throats were common first symptoms among her friends. "Don't assume it's a cold because you're vaccinated," she wrote.

The vaccine reduces the risk of contracting COVID-19. It also protects against serious illness and death from COVID-19, including the Delta variant. And vaccinated people are also less likely to spread the virus to other people, Dr. Anthony Fauci, the US' leading expert on COVID-19, told a White House briefing last week.

However, "breakthrough" infections can happen. Vaccinated people who contract COVID-19 tend to have mild or asymptomatic cases.

Such cases have also been reported among New York Yankees, Texas wedding guests, and Vegas partygoers.