or if you are or plan to become pregnant. kesimpta may cause a decrease in some types of antibodies. the most common side effects are upper respiratory tract infection, headache, and injection reactions. ready for an at-home treatment with dramatic results? it s time to ask your doctor about kesimpta. a bit of news into us as it relates to amtrak, suspending its vaxx requirement for workers. they will give a testing option instead. tom costello covers transportation for us and this is a new change, a new shift for amtrak here.