MRSA Definition and Symptoms. MRSA, methicillin-resistant staphylococcus aureus, is an infection that is caused by a certain strain of staph bacteria that is resistant to the commonly used antibiotics.
The Sahel (/sÉËhÉl/) is the ecoclimatic and biogeographic zone of transition in Africa between the Sahara Desert to the north and the Sudanian Savanna to the south. Having a semi-arid climate, it stretches across the south-central latitudes of Northern Africa between the Atlantic Ocean and the Red Sea.
SaÂ·hel. A semiarid region of north-central Africa south of the Sahara Desert. Since the 1960s it has been afflicted by prolonged periods of extensive drought. [Arabic. , coast, shore (of the Sahara) ; see Swahili .]. SaÂ·helâ²iÂ·an adj.