Can Antibodies Formed Once Protect People from A Second Contract of Coronavirus-- A Fact Check

The two ways of escape from this virus is, one to have an effective vaccine, or herd immunity via at least 60-80% of people becoming infected. Either one of these options requires that people become immune to the coronavirus that causes COVID-19.

AS everybody know the immunity level of a person only can to save themselves from Coronavirus, in the absence of an efficient vaccine. Thus the world is in a vaccine run,to put a on the pademic

If someone recovered from the attack of the virus, can contract a second time? the most disturbing question in everybody.  At the same time many of our society in a belief that, the antibodies formed can protect them from a second attack. What the realfact inside it?

A fact check done by a group in Canada, what happened to the immune systems of the infected and have recovered from COVID-19, and whether they have any protection from the disease now that they have antibodies to the coronavirus that caused it.

In Canada, the national Immunity Task Force has so far examined antibody levels from the blood of 35,000 Canadians across the country who donated blood or who had their blood drawn for medical tests in British Columbia, Alberta and Ontario.

The task force found that the level of coronavirus antibodies in the population, or seroprevalence, barely registered in some cases. 

"The message is clear," said Dr. David Naylor, co-chair of the task force. "Immunity in the Canadian population remains very low." 

Héma-Québec's data suggests 2.23 per cent of samples had antibodies. Samples from Montreal were highest at 3.05 per cent, Naylor said. Samples from B.C., Alberta and Ontario fell in the one per cent range.

Dr. Allison McGeer, a member of the task force's leadership team and an infectious disease physician in Toronto, points to hard-hit New York, where early testing found more than 13 per cent of people had developed antibodies. 

"It's important to remember that the price of being at 13 per cent was a very large number of dead people and catastrophic health care for six or eight weeks," McGeer said.

A 25 yr old patient in Nevada has a confirmed case of #COVID19 reinfection (48 days apart between 1st and 2nd PCR).

This time, unlike the case in Hong Kong, the immune system did not protect this person from reinfection or disease. (1/n)https://t.co/9gMThBoMu2

— Prof. Akiko Iwasaki (@VirusesImmunity) August 28, 2020

Kelvin Kai-Wang To of the University of Hong Kong's microbiology department co-authored a paper on the first documented reinfection, which used genome sequencing to show the first and second infections were caused by different viral strains.

He said the findings suggest that the best hope for stemming the pandemic remains a vaccine.

"Our study only shows that immunity induced from natural infection cannot prevent reinfection for our patient," he said. "Vaccine-induced immunity can be much stronger and last much longer than infection-induced immunity."

The correspondence in the New England Journal of Medicine outlined research on antibodies taken from the blood of 34 patients who had recovered after suffering mainly mild symptoms that didn't require intensive care. Just two needed supplemental oxygen and received an HIV medication, and none were on a ventilator or getting Gilead Sciences Inc.'s remdesivir.

The first analysis was done on antibodies taken an average of 37 days after symptoms began, with a second after about 86 days, or less than three months. The researchers found that antibody levels fell quickly, with a half-life of about 73 days between the two time frames. The loss of antibodies occurred more quickly than with SARS, an earlier type of coronavirus infection.

The antibody collected at two times was examined and it was noticed that the antibody level decreased after 73 days. Covid is rapidly lost from the body of SARS sufferers and the body loses antibodies faster.

It's not yet known how long coronavirus antibodies remain in the body, or whether their presence, and at what level, protects someone against reinfection. There have been documented cases of patients reinfected months after they recovered.