The most common side effects with the "COVID-19 Vaccine Janssen" vaccine were generally mild to moderate and human health improved within a few days after vaccination. Most often, people felt pain at the injection area, complained of headaches, muscle pains, fatigue, they were troubled by nausea. These side effects occurred in more than 1 in 10 subjects in the study.
Cough, joint pain, fever, chills, redness and swelling at the injection area occurred in less than 1 in 10 people. Sneezing, tremor, sore throat, rash, sweating, muscle weakness, pain in the arms and legs, back pain, weakness and general malaise occurred in less than 1 in 100 people.
Rare side effects occurring in less than 1 in 1,000 people consisted of hypersensitive (allergic) and itchy rash.
Allergic reactions, including one severe allergic reaction (case of anaphylaxis), have also been reported with "COVID-19 Vaccine Janssen". As with all vaccines, "COVID-19 Vaccine Janssen" vaccine should be administered under close medical supervision of a doctor and a possibility to provide appropriate treatment.