Warm and pleasant. Nothing of importance. Some of the boys are quite sick from the effects of vaccination, though on some of them it did not work. Mine worked fine, and some of the boys took virus from my arm and vaccinated themselves. The surgeon vaccinated a few of the boys as many as four or five times before it took.
Source: Alexander G. Downing, Edited by Olynthus B., Clark, Downing’s Civil War Diary, p. 29-30