Secretary General of Health Services Dr Yaqub Al-Mazrou has highlighted the big strides made by the health services in the Kingdom of Saudi Arabia, notably in the field of vaccinations. In a statement on the occasion of the International Vaccination Week, he said Saudi officials have always been keen on extending health services to citizens in all parts of the Kingdom. The Primary Health Care Centers have been playing a crucial role in providing the citizens with the required health services, he said.