Hilary Duffhas been diagnosed with COVID-19.TheHow I Met Your Fatherstar, 33, shared the news Friday that she’d contracted a breakthrough case of the virus just days after production began for the upcomingHow I Met Your Mothersequel series.“That delta…she’s a little bitch,” Duff wrote on her Instagram Story, adding that she had a “bad headache” and had lost her sense of taste and smell. She also said she felt sinus pressure and “brain fog.““Happy to be vaxxed,” the actress concluded, adding a peace sign emoji.Breakthrough cases— COVID-19 infections that occur in people who have been fully vaccinated against the virus — are rare, but possible and expected, as the vaccines are not 100% effective in preventing infections. Still, vaccinated people who test positive will likely be asymptomatic or experience a far milder illness than if they were not vaccinated. The majority of deaths from COVID-19 — around 98 to 99% —are in unvaccinated people.RELATED GALLERY:Celebrities Who’ve Tested Positive for COVID in 2021Hilary Duff/instagramDuff isn’t the first celebrity to share that they had contracted a breakthrough case of COVID-19. On Thursday,Melissa Joan Hartrevealed thatshe also had coronavirusafter being fully vaccinated.“I am vaccinated and I got COVID, and it’s bad,” she said told fans. “It’s weighing on my chest. It’s hard to breathe. One of my kids, I think, has it so far. I’m praying that the other ones are okay.“The actress — who shares sonsTucker McFadden, 8,Braydon Hart, 13, andMason Walter, 15, with husbandMark Wilkerson— went on to explain that she and her family had taken precautions throughout the pandemic, but “got a little lazy” as restrictions were lifted.“I think as a country we got a little lazy and I’m really mad that my kidsdidn’t have to wear a mask at school. I’m pretty sure where this came from,” she said. “I’m just scared and sad, and disappointed in myself and some of our leaders. I just wish I’d done better, so I’m asking you guys to do better. Protect your families. Protect your kids.““It’s not over yet,” Hart added of the ongoing pandemic. “I hoped it was, but it’s not, so stay vigilant and stay safe.“Melissa Joan Hart.Melissa Joan Hart/instagramCOVID-19 cases had been on the decline as Americans got vaccinated, dipping down to around 11,000 a day in early June. But asthe delta variant became the dominant strain in the United States, cases again soared back to levels not seen since February, when the vaccines were not readily available to all Americans.The biggest increase in cases have been in southern states like Louisiana, Missouri, Arkansas and Florida, all of whichhave some of the lowest vaccination rates in the country.Currently, children under the age of 12 are at risk of contracting the virus as they are not eligible to receive the vaccine.As a precaution, the Centers for Disease Control and Prevention (CDC) have recommendeduniversal indoor maskingfor all regardless of vaccination status.As of Thursday, 51.2 percent (170 million) of the nation’s populace is fully vaccinated against COVID-19, according todata from the CDC, while 60.4 percent (200.4 million) have received at least one dose.As information about thecoronavirus pandemicrapidly 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 theCDC,WHOandlocal public health departments.PEOPLE has partnered with GoFundMeto raise money for the COVID-19 Relief Fund, a GoFundMe.org fundraiser to support everything from frontline responders to families in need, as well as organizations helping communities. For more information or to donate, clickhere.
Hilary Duffhas been diagnosed with COVID-19.
TheHow I Met Your Fatherstar, 33, shared the news Friday that she’d contracted a breakthrough case of the virus just days after production began for the upcomingHow I Met Your Mothersequel series.
“That delta…she’s a little bitch,” Duff wrote on her Instagram Story, adding that she had a “bad headache” and had lost her sense of taste and smell. She also said she felt sinus pressure and “brain fog.”
“Happy to be vaxxed,” the actress concluded, adding a peace sign emoji.
Breakthrough cases— COVID-19 infections that occur in people who have been fully vaccinated against the virus — are rare, but possible and expected, as the vaccines are not 100% effective in preventing infections. Still, vaccinated people who test positive will likely be asymptomatic or experience a far milder illness than if they were not vaccinated. The majority of deaths from COVID-19 — around 98 to 99% —are in unvaccinated people.
RELATED GALLERY:Celebrities Who’ve Tested Positive for COVID in 2021
Hilary Duff/instagram

Duff isn’t the first celebrity to share that they had contracted a breakthrough case of COVID-19. On Thursday,Melissa Joan Hartrevealed thatshe also had coronavirusafter being fully vaccinated.
“I am vaccinated and I got COVID, and it’s bad,” she said told fans. “It’s weighing on my chest. It’s hard to breathe. One of my kids, I think, has it so far. I’m praying that the other ones are okay.”
The actress — who shares sonsTucker McFadden, 8,Braydon Hart, 13, andMason Walter, 15, with husbandMark Wilkerson— went on to explain that she and her family had taken precautions throughout the pandemic, but “got a little lazy” as restrictions were lifted.
“I think as a country we got a little lazy and I’m really mad that my kidsdidn’t have to wear a mask at school. I’m pretty sure where this came from,” she said. “I’m just scared and sad, and disappointed in myself and some of our leaders. I just wish I’d done better, so I’m asking you guys to do better. Protect your families. Protect your kids.”
“It’s not over yet,” Hart added of the ongoing pandemic. “I hoped it was, but it’s not, so stay vigilant and stay safe.”
Melissa Joan Hart.Melissa Joan Hart/instagram

COVID-19 cases had been on the decline as Americans got vaccinated, dipping down to around 11,000 a day in early June. But asthe delta variant became the dominant strain in the United States, cases again soared back to levels not seen since February, when the vaccines were not readily available to all Americans.
The biggest increase in cases have been in southern states like Louisiana, Missouri, Arkansas and Florida, all of whichhave some of the lowest vaccination rates in the country.
Currently, children under the age of 12 are at risk of contracting the virus as they are not eligible to receive the vaccine.
As a precaution, the Centers for Disease Control and Prevention (CDC) have recommendeduniversal indoor maskingfor all regardless of vaccination status.
As of Thursday, 51.2 percent (170 million) of the nation’s populace is fully vaccinated against COVID-19, according todata from the CDC, while 60.4 percent (200.4 million) have received at least one dose.
As information about thecoronavirus pandemicrapidly 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 theCDC,WHOandlocal public health departments.PEOPLE has partnered with GoFundMeto raise money for the COVID-19 Relief Fund, a GoFundMe.org fundraiser to support everything from frontline responders to families in need, as well as organizations helping communities. For more information or to donate, clickhere.
source: people.com