Despite being vaccinated more than a week ago, a San Diego nurse who was vaccinated with Pfizer during the first promotion was diagnosed with COVID-19 infection on December 26.
ABC 10 news report The nurse’s name is Matthew W., he worked as an emergency room attendant in two independent hospitals in Southern California, and only pointed out that after the vaccination, his arm was sore but there were no other side effects.
Then, on Christmas Eve, after transferring the COVID-19 unit, Matthew fell ill with symptoms of chills, muscle aches and fatigue.
On December 26, he tested positive for COVID-1
Officials said that despite the disappointment, public health experts were not surprised by the result.
Christian Ramers, an infectious disease expert at the San Diego Family Health Center, told reporters: “This is not unexpected. If you calculate by numbers, this is exactly what we expect someone to expose.”
Ramos also pointed out that Matthew may have been infected before the vaccination and began to show symptoms after the vaccination.
He added: “We know from clinical trials of the vaccine that it takes about 10 to 14 days to start to protect the vaccine.”
At that time, Matthew only received a single dose of the vaccine.Pfizer vaccine consists of two separate vaccines, which will be injected intravenously Three weeks apart.
document According to data released by the US Centers for Disease Control and Prevention, the average infection prevention efficiency of a single dose of Pfizer vaccine is 88.9%. The researchers pointed out that the lack of available data due to the results of participants who received only a single dose of the vaccine “cannot support conclusions about the efficacy of a single dose of vaccine” because most clinical trial participants received both doses.
Ramos said that after the first dose of the vaccine, the effective rate may be around 50%, while the second dose of vaccine has a stronger antiviral effect, reaching 95%.
Lammers added: “You heard that health practitioners are very optimistic about it as the beginning of the end, but as we introduce this vaccine, it will be a slow process, ranging from a few weeks to a few months. ”