Israel achieved 50 booster doses per 100 of population on January 9th, after which deaths soared anyway

Vitamin D deficiency is endemic across the Middle East, including in Israel, where nearly four in five people are low on the vitamin . . .. 

More.

US COVID-19 update Mar 20 - Apr 17, 2021

Hospitalized Mar 20: 33164

                     Apr 17: 39090

                     +18%

Case positivity rate Mar 20: 4.5%

                                Apr 13: 7.6%

                                +69%

Daily new deaths per million Mar 20: 3.13

                                               Apr 17:  2.17

                                               -31%

Daily new deaths Mar 20: 1038

                             Apr 17:   719

                             -31%

But . . .

The bi-weekly change in confirmed deaths was dropping much faster on Mar 23, 37.15%, than it is on Apr 17, 7.4%. Indeed, the Mar 23 low was a retest of the 2020 low from last June 2 at 33.6%, after the initial outbreak of the pandemic subsided. It is itself the new low in the series.

There's been a dramatic slow down in the drop of bi-weekly change. The measure has itself been consistently rising since the advent of spring.

 

That doesn't make any sense in an environment in which increased vaccination, which is supposed to reduce severity of illness and therefore hospitalization and death, is occurring.

Share fully vaccinated Mar 20: 12.9%

                                     Apr 17: 24.7%

                                     +91%

Hospitalizations are clearly up, and deaths are falling but at a much slower rate than they were falling when there was much less vaccination, and colder weather, in the country.

Warmer weather is supposed to mean improving conditions. People get outside and get fresh air and Vitamin D, reducing spread of the infection. That's the theory anyway.

But the data say otherwise.

Daily new confirmed cases per million hit an interim low of 162.17 on Mar 14, and retested that on Mar 23 at 162.12. As of Apr 16 the figure is 211.77, up 31%. Those levels are nothing to write home about. ~100 per million, as in September 2020, would be.

This virus has a mind of its own. 

Homo proponit, sed SARS-CoV-2 disponit.

Rush Limbaugh, The Big Fat Idiot, imagines Vitamin D was known during the Spanish Flu Epidemic when it wasn't even first theorized until 1922

In the Face of COVID-19, We’re Not Acting at All Like Americans:

In the Spanish flu, ’17, ’18, ’19, 1917, much death. Do you know that there was not one mention of it by the president of the United States at the time, Woodrow Wilson? Never talked about it. There was no national policy to deal with it. There was no shutdown. There was just, “Hey, go outside, get some fresh air, stand in the sun as long as you can, get some vitamin D, feel better.”

Vitamin D:

In 1922, Elmer McCollum tested modified cod liver oil in which the vitamin A had been destroyed.[12] The modified oil cured the sick dogs, so McCollum concluded the factor in cod liver oil which cured rickets was distinct from vitamin A. He called it vitamin D because it was the fourth vitamin to be named.[194][195][196] It was not initially realized that, unlike other vitamins, vitamin D can be synthesised by humans through exposure to UV light.