any thing that can change our normal behaviour of immune system is called disease , are been caused by some harmful pathogen and this pathogen is eighter in the food we eat or the water we taken inside our body people suffer in what they eat and drink example is food poisoning

this pathogen are harmful to us ,some part in the world like ebony state are still using rake water and stream water for their cocking and drinking this contain organic remain and are not stable for drinking or cocking
while some use well water example enugu state known as the coal city use well water ffor cocking and drinking and the deep of the well is not okay for human use
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