https://www.scientificamerican.com/article/if-you-dont-have-covid-vaccine-side-effects-are-you-still-protected/ > Last month Robert Duehmig and Bill Griesar—a married couple in their 50s who live in Astoria, Ore., and Portland, Ore.—were each relieved to get their second shot of the Pfizer-BioNTech vaccine for COVID-19. After the jab, Griesar felt nothing more than a sore arm. But for Duehmig, the effects were more pronounced. > “I woke up during that first night ... with the chills and some body aches and just not feeling well by the morning,” Duehmig says. “I really didn’t want to do anything but sleep that day, which is about all I did.”