In one sentence, describe what the following article is about:

Viral illnesses like rubella are usually associated with weakness and the feeling that you do not want to get out of bed. This is how our body tell us that we need more rest and sleep.  During sleep, the immune system releases cytokines. Cytokines are protein molecules that help to fight off inflammation and infection by telling the immune system which specific viral cells it should be attacking.  When you are recovering from rubella (or any viral illness) It is recommended that you get at least 8 to 10 hours sleep a day to allow your body to fight off the infection. Rubella causes fever, which in turn causes your body to sweat more. This results in a loss of fluid, leading to dehydration.  To replace these lost fluids and prevent dehydration, you should aim to drink at least 10 glasses of water per day. If you have difficulty drinking this much fluid, you can also increase your water intake by drinking herbal teas and by eating fruit and veg with a high water content, such as watermelon, tomatoes, celery, beets, grapefruit and melon. One of the major symptoms of rubella is an itchy rash which can be very irritating. You can use calamine lotion (available over-the-counter at most pharmacies) to provide relief for this itchy rash.  Calamine lotion works using a counter-irritant effect. Once applied, it evaporates off the surface off the skin, producing a cooling effect that minimizes the itch. You can apply calamine lotion to the affected skin using a piece of cotton wool. Do this three times a day, or as necessary. Vitamin C boosts the immune system by triggering the production of phagocytes which are cells that kill foreign bodies by ingesting them. This helps your body to fight off the rubella virus more quickly.  Be sure to get your daily those of Vitamin C by eating fruits and vegetables with every major meal. Fruits and vegetables rich in Vitamin C include: Blackberries, blueberries, broccoli, raw green cabbage, cauliflower, cranberries, garlic, grapefruit, kale, lemon, lime, mandarin orange, mango, melon, orange, papaya, passion fruit, pineapple, potato, raspberries, spinach, strawberries, tangerine and tomato.

Summary:
Get plenty of bedrest and sleep. Increase your oral fluid intake. Use calamine lotion to soothe itchy rashes. Add vitamin C-rich foods to your diet.