But some scientists say it is increasingly clear that the Sinopharm vaccine does not offer a clear path toward herd immunity, particularly when considering the multiple variants appearing around the world.

Governments using the Sinopharm vaccine “have to assume a significant failure rate and have to plan accordingly,” said John Moore, a vaccine expert at Cornell University. “You have to alert the public that you will still have a decent chance of getting infected.”

Many in Seychelles say the government has not been forthcoming.

“My question is: Why did they push everyone to take it?” said Diana Lucas, a 27-year-old waitress who tested positive on May 10. She said she received her second dose of the Sinopharm vaccine on Feb. 10.

Emmanuelle Hoareau, 22, a government lawyer, tested positive on May 6 after getting the second dose of the Sinopharm vaccine in March. “It doesn’t make sense,” she said. She said the government had failed to give the public enough information about the vaccines.

“They are not explaining to the people about the real situation,” she said. “It’s a big deal — a lot of people are getting infected.”

Ms. Hoareau’s mother, Jacqueline Pillay, is a nurse in a private clinic in Victoria, the capital. She said she believes there is a new variant in Seychelles because of an influx of foreigners who have arrived in recent months. The tourism-dependent country opened its borders on March 25 to most travelers without any quarantine.

“People are very scared now,” said Ms. Pillay, 58. “When you give people the right information, then people would not speculate.”

Health officials have recently appeared on television to encourage those who have only taken the first dose of the Sinopharm vaccine to return for the second shot. But Ms. Pillay said she is frustrated that the public health commissioner has not addressed why the vaccines don’t appear to be working as well as they should.

“I think a lot of people aren’t coming back,” said Ms. Pillay.

Marietta Labrosse, Elsie Chen and Claire Fu contributed research.

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