After the rapper Nicki Minaj questioned the efficacy of the Covid-19 vaccine in a Twitter post this week, the White House confirmed on Wednesday that it had offered her a call with a doctor to answer questions about the safety of the vaccine.

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Ms. Minaj appeared to believe that she was going to visit the White House. She said on Twitter on Wednesday that she would “be dressed in all pink like Legally Blonde so they know I mean business.”

“I’ll ask questions on behalf of the ppl who have been made fun of for simply being human,” she added.

On Monday, Ms. Minaj asserted that her cousin’s friend in Trinidad and Tobago “became impotent” after receiving the vaccine, a claim that nation’s minister of health, Terrence Deyalsingh, rejected.

“There has been no such reported either side effect or adverse event,” he said in a news conference online. “And what was sad about this is that it wasted our time yesterday, trying to track down, because we take all these claims seriously, whether it’s on social media or mainstream media.”

One of the invitees to the meeting, Tim Boyle, the chief executive of Columbia Sportswear, said in an interview on Wednesday that his company had drafted a policy mandating vaccines months ago. But it had held off carrying it out until Mr. Biden announced last week that he was directing the Labor Department to issue an emergency safety declaration that would effectively function as a vaccine mandate for tens of millions of workers. Columbia Sportswear told its workers that it will put a vaccine requirement in place next week.

Mr. Boyle said Columbia was concerned that by acting alone it would risk losing as many as half of its workers in distribution centers and retail stores. Mr. Biden’s order, he said, reduced the risk that workers who don’t want to get vaccinated would quit to work elsewhere.

“There’s much less opportunity for people to go somewhere they don’t need to be vaccinated,” he said.

Mr. Boyle said vaccinations had divided Columbia’s work force. Managers in its Portland, Ore., headquarters have largely embraced the shots, he said, but retail and warehouse workers throughout the country have been more reluctant. He said that hesitancy had hurt the company, with infections and the threat of infection forcing closures and cleanings of locations.

“Those operations are predicated on people working together closely,” he said. Having unvaccinated workers is “highly disruptive.”

Several of the business leaders who met with Mr. Biden have installed mandates already, for at least part of their work force, including Disney, Walgreens and Children’s Hospital of Philadelphia.

Baseline median sperm concentration and TMSC were 26 million/mL (IQR, 19.5-34) and 36 million (IQR, 18-51), respectively. After the second vaccine dose, the median sperm concentration significantly increased to 30 million/mL (IQR, 21.5-40.5; P = .02) and the median TMSC to 44 million (IQR, 27.5-98; P = .001). Semen volume and sperm motility also significantly increased .

Eight of the 45 men were oligospermic before the vaccine (median concentration, 8.5 million/mL ). Of these 8, 7 men had increased sperm concentration to normozoospermic range at follow-up (median concentration, 22 million/mL ), and 1 man remained oligospermic. No man became azoospermic after the vaccine.