"prevent sickness" is a grammatically correct phrase and can be used in written English.
It means to take actions or measures to avoid or stop someone from becoming sick. Example: "Regular hand washing helps to prevent sickness and the spread of germs."
These physicians might also draw on other medical professionals to treat individuals who are sick, and prevent sickness from occurring in the first place.
Some even get sick thinking about how to prevent sickness.
Companies use them to prevent sickness when animals are packed together in ways that breed infection.
In Malaysia, women take a drink made from the boiled leaves of Nervilia aragoana to prevent sickness after childbirth.
She had taken the hormones for nineteen years, in the hope that they would prevent sickness; now she was convinced that the result of her efforts would be cancer.
Iban ceremonial songs are sung in connection with rice festivals and rituals to prevent sickness, while mourning songs make up a rich repertoire of solo and leader chorus singing.
From this research, beer seems to be a wonder beverage, which can prevent sicknesses like osteoporosis, diabetes, ulcers, Parkinson, senility and heart attacks.
The agency also calls for "judicious" use in preventing sickness.
A little stick passed through the nasal septum, such as that used by the Pawumwa of the Guaporé River, prevents sickness.
Many persons, in nearly all times, have held, seriously or half-seriously, irrational beliefs concerning methods of warding off ill or bringing good, foretelling the future, and healing or preventing sickness or accident.
There have also been sins of commission at health-maintenance organisations (HMOs, firms that seek to "rationalise" health care by squeezing discounts out of doctors and finding more cost-effective ways of treating and preventing sickness).
