I have read a number of articles recently mentioning the waning effectiveness of most of the vaccines as the variants become the dominant varieties of Covid. Some of them mentioned ongoing studies that have used placebo controlled methodology. For some very strange reason Google and other search engines appear to be filtering this type of article from their results making them more difficult to find, and the links for a couple that I hoped to share when I received your request are no longer working.
The ones still appearing this morning are from sources such as CNBC, MSN, Yahoo, etc... which can hardly be considered unbiased news sources. But here are a couple of those anyway. The first mentions the double blind methodology used, when claiming 65.2% effectiveness which apparently is better than other vaccines on the market...
“Covaxin, a whole-virion inactivated SARS-CoV-2 vaccine used for mass immunization in the country, showed a 65.2 percent protection against the Delta variant in a double-blind, randomized, multicentre, phase 3 clinical trial.”
“Preliminary data from the Israeli Ministry of Health suggests that Pfizer's vaccine could be only 39% effective at preventing symptomatic infections from the variant”
“If that sounds like bad news for Pfizer and Moderna shareholders, it isn't. The vaccines made by Johnson & Johnson (NYSE: JNJ) and AstraZeneca (NASDAQ: AZN) appear to perform even worse against the variant. In fact, they're suspected of performing so much worse that public health officials in places like Italy are allowing certain people who have received jabs of these two vaccines to get booster shots of Pfizer or Moderna. This hodgepodge vaccination solution is supported by a growing body of evidence, and it's bad news for AstraZeneca as well as Johnson & Johnson.”
https://news.yahoo.com/delta-infections-among-vaccinated-likely-192553854.html
“They note that in COVID-19 survivors, the immune system's antibodies evolve during the first year, becoming more potent and better able to resist new variants. In 32 volunteers who never had COVID-19, they found that antibodies induced by mRNA vaccines did evolve between the first and second shots.”
I am not sure why you two believe that the CDC recently recommended people who are vaccinated start wearing masks again in public.
"recent mask guidance update is based on a study that evaluated the efficacy of a COVID-19 vaccine that’s “not approved in America.” The article appears to be making reference to the Covaxin vaccine study mentioned in the first link above. More recent studies of vaccines which have been approved here are showing that their effectiveness is waning when faced with variants. It would appear that the results are currently being actively delayed, suppressed or otherwise withheld from the public which is likely the primary reason why the CDC is not citing them. The CDC knows why they are now recommending masks for the vaccinated but sharing the data will further undermine the public's confidence in the "experimental vaccines". There is a reason that there have been no successful vaccines for the illness most similar to Covid, the common cold. Rhinoviruses and coronaviruses are constantly evolving rendering traditional vaccines ineffective in a short period of time. This is why the mRNA "experimental vaccines" were introduced for the coronavirus; it was hoped that their effectiveness would be more long lived. Unfortunately it now appears that juiced up gain of function simple one cell organisms are now easily defeating the mRNA technique. This entire botched up experiment is not performing in a way that resembles the claims made by authorities. Fortunately as Covid mutates it appears that the symptoms are becoming less severe even as it becomes easier to catch which will mean that the miracle of the human immune system once again will hopefully save humanity. And the wishes of the recently deceased Prince Philip, Duke of Edinburgh that he would come back as a deadly virus after death and kill most of the people on earth... will not be realized.
Sorry, forgot to include the html needed to break up my last paragraph.
So you think these items are evidence supporting the following statement of yours that I questioned in post 63 above?
“Double blind studies are starting to show no advantage between some of the vaccines over placebos when faced with variants.”