Malaria is transmitted by the night-time - dusk to dawn - biting female Anopheles mosquito.
Risk is present in the western emirates of 'Asir, and Jizan bordering Yemen.
Note: The cities of Jeddah, Medina, Mecca, Taif, and Riyadh are risk free.
Risk is absent in most of the country; risk exists only in specified areas:
High risk months for Malaria are: January to December
Incidence of Plasmodium falciparum Malaria: 97%
Areas with drug resistant Malaria: P. falciparum malaria is resistant to chloroquine. Resistance is present in all malarious areas of Saudi Arabia.
Suppressive medication is not recommended.
Travellers going to risk areas should follow meticulous anti-mosquito bite measures from dusk to dawn during the malaria season. Download IAMAT's whitepaper
How to Protect Yourself Against Malaria for details.