Hello,my name is dr.Dorina Gurabardhi. The pneumococcal vaccine is very safe, although, like all vaccinations, it has some side effects. It is not possible to catch a pneumococcal infection from the vaccine, as the vaccine doesn t contain any live bacteria. Some side effect include: -decreased appetite -a slightly raised temperature -irritability -redness at the site of the injection -hardness or swelling at the site of the injection -feeling sleepy -not sleeping well Most common side effects such as swelling or redness at the injection site, usually pass within a couple of days and you don t need to do anything about them.You should keep stay cool. Make sure you don t wear too many layers of clothes or blankets, and drink cool drinks. You can also take a dose of paracetamol or ibuprofen. Hope my answer helped you.Thanks!