Active immunisation is acquired by a course of 3 injections, followed by a booster either every 10 years or after potentially dangerous wounds. The number of countries requiring malaria-prevention is decreasing. Wear long sleeves and trousers at night to avoid insect bites. Use an insect repellant on exposed parts. If you develop chills or fever within 4 weeks after your return please consult your doctor.
Prevention is by vaccination.
A course of 2 vaccinations is given 6-12 months apart. Immunity starts within 2 weeks after the 1st vaccination and lasts for 10 years after 2 vaccinations. You may require protection for Meningococcal Meningitis. Japanese B Encephalitis or other vaccinations depending on your destination. Under the International Health Regulations, International Certificates of Vaccination against Yellow Fever may be required for travellers entering some parts of Central and South America and some African countries.