The latest coronavirus vaccine arriving at Iowa pharmacies and public health departments is made by Johnson & Johnson.
The Moderna and Pfizer vaccines both require two shots while the Johnson & Johnson vaccine requires only one.
The first two vaccines must be kept chilled while the Johnson and Johnson vaccine does not.
Studies show the Moderna and Pfizer vaccines are about 95% effective in preventing coronavirus, while the Johnson & Johnson vaccine is about 66% effective.
But trials show all three vaccines reduce the rate of COVID-19 hospitalization and death by 100%.
And trials in South Africa show the Johnson & Johnson vaccine is also effective against some of the new COVID-19 variants, but it is not yet known if that is true for the Pfizer and Moderna vaccines.
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