Shingles is not contagious, but the varicella-zoster virus that causes it can be spread to another person who hasn't had chickenpox, and they could develop the disease. You can't get shingles from someone with shingles, but you can get chickenpox.

The varicella-zoster virus is spread when someone comes into contact with an oozing blister. It is not contagious if the blisters are covered or after they have formed scabs.

To prevent spreading the varicella-zoster virus if you have shingles, be sure to keep the rash clean and covered. Don't touch the blisters and wash your hands often.

You should avoid being around at-risk people such as pregnant women and people with weak immune systems.

Influenza (flu) vaccine effectiveness (VE) can vary. The protection provided by a flu vaccine varies from season to season and depends in part on the age and health status of the person getting the vaccine and the similarity or "match" between the viruses in the vaccine and those in circulation. During years when the flu vaccine match is good, it is possible to measure substantial benefits from flu vaccination in terms of preventing flu illness and complications. However, the benefits of flu vaccination will still vary, depending on characteristics of the person being vaccinated (for example, their health and age), what influenza viruses are circulating that season and, potentially, which type of flu vaccine was used.

Read more at: https://www.cdc.gov/flu/prevent/flushot.htm