Those travelling to Saudi Arabia for Umrah no longer require to be vaccinated against Neisseria meningitis. This was informed by the General Authority of Civil Aviation (GACA) in a new circular on ...

Morocco has taken all necessary measures to secure an adequate supply of meningitis vaccines following Saudi Arabia’s ...

pH is a measure of how acidic or alkaline a solution is. The diagram below shows what happens to an enzyme when denaturation occurs. Each enzyme has an optimum pH but it also has a working range ...