It is very important for people with chronic diseases, such as SLE,and for those people taking corticosteroids and immunosuppressants, including chemotherapy drugs, should go to their doctor to be immunised against flu. Flu is not a bad cold! It can be dangerous.
You may come across the anti-vaxers who will try to scare you into not having your flu shots. They may sound credible, with references to scientific papers, but they are false!
Apart from the annual flu jab, ask your doctor about the pneumovax vaccine which will help prevent serious problems with the lungs. Those with asthma should also ask about the various kinds of vaccines available.
Finally, Herpes Zoster infections can lead to the risk of strokes in certain populations which include, rheumatoid arthritis and SLE. There is a new post with information, along with a video.