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Herd immunity and COVID-19: What you need to know
To protect groups of people over time, it helps to know what level of recovery or vaccination in a population makes it hard for a germ to spread.
COVID-19 travel advice
Concerned about COVID-19 when you travel? Follow these tips for safely flying, driving and staying at hotels.
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
Jaw surgery
Jaw surgery corrects irregularities of the jaw bones and realigns the jaws and teeth to improve the way they work and it often improves appearance.
Facial fillers for wrinkles
Find out more about facial injections, also called soft tissue fillers, that can temporarily smooth wrinkles.
Outpatient joint replacement: Is it a safe option?
Joint replacement of the hip, knee and shoulder can be done safely as outpatient surgery. Most people can go home the same day as the procedure.
Video: An asthma attack
What happens to your airways during an asthma attack?
Balance exercises
These exercises can improve balance and help prevent falls. See how they're done.
Guide to different tick species and the diseases they carry
Learn about different tick species and some of the diseases they may carry.
Inherited metabolic disorders
Caused by gene changes, these disorders affect the body's ability to change food into energy. They also affect how energy is used, such as for cell repair.
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