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 region is in sub-Saharan Africa and is a transition zone between the arid Sahara desert to the north and the tropical green forest to the south, covering a surface area of 5.7 million Km2 with a population of about 60 million inhabitants.he Sahel region is in sub-Saharan Africa and is a transition zone between the arid Sahara desert to the north and the tropical green forest to the south, covering a surface area of 5.7 million Km2 with a population of about 60 million inhabitants.