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Where EAST meets the Northwest


AP Illustration/Peter Hamlin

Should I get a COVID-19 vaccine if Iíve had the virus?

By The Associated Press

www.asianreporter.com

January 13, 2021

Should I get a COVID-19 vaccine if Iíve had the virus?

Yes. Regardless of previous infection, the U.S. Centers for Disease Control and Prevention says people should plan on getting vaccinated when itís their turn.

"Itís a pretty straightforward question," said Johns Hopkins infectious disease specialist Dr. Amesh Adalja. "Yes, you need to get vaccinated."

After someone recovers, their immune system should keep them from getting sick again right away.

"Your immune system is able to identify the virus, and protect itself," said Dr. Saskia Popescu, an infectious disease expert at George Mason University.

Scientists still donít know exactly how long this immunity lasts or how strong it is, though recent research suggests the protection could last for several months.

Itís impossible to know how long a person might be immune, said Dr. Prathit Kulkarni, an infectious disease expert at Baylor College of Medicine. "Thereís no way to calculate that."

Vaccines, by contrast, are designed to bring about a more consistent and optimal immune response. And they should boost whatever preexisting immunity a person might have from an infection, experts say.

"Since weíre in this pandemic, and donít have a handle on it, the safer approach is to vaccinate," Kulkarni said. "You donít lose anything and you stand to benefit."

If youíve been infected in the last three months, the CDC says itís OK to delay vaccination if you want to let others go first while supplies are limited.

"All things being equal you would want the person with no protection to go first," Adalja said.

* * *

Studies find having COVID-19 may protect against reinfection

By Marilynn Marchione

The Associated Press

December 23, 2020

Two new studies give encouraging evidence that having COVID-19 may offer some protection against future infections. Researchers found that people who made antibodies to the coronavirus were much less likely to test positive again for up to six months and maybe longer.

The results bode well for vaccines, which provoke the immune system to make antibodies ó substances that attach to a virus and help it be eliminated.

Researchers found that people with antibodies from natural infections were "at much lower risk ... on the order of the same kind of protection youíd get from an effective vaccine," of getting the virus again, said Dr. Ned Sharpless, director of the U.S. National Cancer Institute.

"Itís very, very rare" to get reinfected, he said.

The instituteís study had nothing to do with cancer ó many federal researchers have shifted to coronavirus work because of the pandemic.

Both studies used two types of tests. One is a blood test for antibodies, which can linger for many months after infection. The other type of test uses nasal or other samples to detect the virus itself or bits of it, suggesting current or recent infection.

One study, published by the New England Journal of Medicine, involved more than 12,500 health workers at Oxford University Hospitals in the United Kingdom. Among the 1,265 who had coronavirus antibodies at the outset, only two had positive results on tests to detect active infection in the following six months and neither developed symptoms.

That contrasts with the 11,364 workers who initially did not have antibodies; 223 of them tested positive for infection in the roughly six months that followed.

The National Cancer Institute study involved more than 3 million people who had antibody tests from two private labs in the United States. Only 0.3% of those who initially had antibodies later tested positive for the coronavirus, compared with 3% of those who lacked such antibodies.

"Itís very gratifying" to see that the Oxford researchers saw the same risk reduction ó 10 times less likely to have a second infection if antibodies were present, Sharpless said.

His instituteís report was posted on a website scientists use to share research and is under review at a major medical journal.

The findings are "not a surprise ... but itís really reassuring because it tells people that immunity to the virus is common," said Joshua Wolf, an infectious disease specialist at St. Jude Childrenís Research Hospital in Memphis who had no role in either study.

Antibodies themselves may not be giving the protection, they might just be a sign that other parts of the immune system, such as T cells, are able to fight off any new exposures to the virus, he said.

"We donít know how long-lasting this immunity is," Wolf added. Cases of people getting COVID-19 more than once have been confirmed, so "people still need to protect themselves and others by preventing reinfection."

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Instituteís Department of Science Education. The AP is solely responsible for all content.

 

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