The latest coronavirus vaccine arriving at Iowa pharmacies and public health departments is made by Johnson & Johnson.
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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