QUESTION: Wouldnt any CV19 vaccine have to be 98% effective vs 50% effective like some Flu vaccines?

[Ms. Toad]

22. No it disproves your point.

You said:

The reports I have seen are that people have tested positive, then negative, then positive again, without symptoms on the first test.

This does NOT mean they had COVID twice - much more likely that the first test was a false positive

From the article I linked to:

Two patients in New Jersey, for instance, appear to have contracted Covid-19 a second time almost two months after fully recovering from their first infection. Daniel Griffin, a physician and researcher at Columbia University in New York, recently described a case of presumed reinfection on the This Week in Virology podcast.

It is possible, but unlikely, that my patient had a single infection that lasted three months. Some Covid-19 patients (now dubbed “long haulers”) do appear to suffer persistent infections and symptoms.

My patient, however, cleared his infection — he had two negative PCR tests after his first infection — and felt healthy for nearly six weeks.

First, it was three patients - not one. One patient is specifically discussed, but two more are identified.

For the patient specifically discussed, the second illnesses came nearly two months after the first.

They actually had significant symptoms (not a false positive test without symptoms)

They tested negative between the first and second illness.

They they had worse symptoms and tested positive again (again, not a false positive test without symptoms)

Following the link in the article would have taken you to this description of the two additional patients referenced:

https://dailyvoice.com/new-jersey/monmouth/news/central-jersey-doctor-reports-patients-reinfected-with-coronavirus/790555/

Ditchek said the first patient had COVID-19 a few months ago, tested negative for months in between, went to a party last weekend, and then tested positive for coronavirus this week. "So that is a reinfection," the doctor said.

. . .

Ditchek said he encountered a second reinfected patient on Wednesday from the same family. This patient had accumulated so many antibodies from his previous COVID-19 infection that he was able to donate plasma to other coronavirus patients two times.

"He'd been negative for seven weeks and sure enough was re-exposed," Ditchek said, and diagnosed positive for COVID-19 this week.

That is not at all the situation you have described. It is the situation you say is not happening.