A 45-year-old nurse in California tested positive for COVID-19 over a week after receiving Pfizer Inc.’s coronavirus vaccine, an ABC News affiliate reported on Tuesday.

Matthew W, a nurse at two different local hospitals, said in a Facebook post on December 18 that he had received the Pfizer vaccine.

In his statement he said that his arm was aching for whole day but he had no other side-effects.

In addition to this statement he said, after six days later on Christmas he fell sick after at work shift in the COVID-19 unit. He took some rest and later came down with muscle aches and lethargic.

He went to hospital by car at the hospital’s testing site and tested positive for COVID-19 the day after Christmas, the report said.

Christian Rammers, an infectious disease specialist with Family Health Centers of San Diego, told the ABC News affiliate that this scenario was not unexpected.

"We know from the vaccine clinical trials that it's going to take about 10 to 14 days for you to start to develop protection from the vaccine," Ramers said.

"That first dose we think gives you somewhere around 50%, and you need that second dose to get up to 95%," Rammers added.

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