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.
The Sahel Zone. The Sahel Zone lies between the Sahara desert in the north and the grasslands of Central Africa in the south. It stretches over 5,000 km across the African continent from the Atlantic Ocean to the Red Sea. The Sahel Zone is between 600 and 1,000 km wide and covers an area of 3 million square kilometers.