The impact of preventive measures on acute illnesses among pilgrims during Hajj season por Yousef M. Alsofayan, Fahad A. Alamri, Faten A. Alradini, Nashwa M. Radwan, Anas A. Khan, Ahmed Alahmari, Sari I. Asiri, Nagla E. Mahmoud, Mustafa S. Hassanein, Nouf A. Aleisaa, Mohammad A. Alzahrani, Khaled I. Alabdulkareem