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कोरोना वायरस बहुत सूक्ष्म वायरस का एक समूह है जो बहुत से mammals व पक्षियों को संक्रमित करते हैं।
6 अगस्त 1945 को bomber ‘Enola Gay’ ने हिरोशिमा के ऊपर ‘Little boy’ 16 किलोटन का परमाणु बम छोड़ा।विस्फोट के कारण शहर के 4.2 लाख निवासियों में से 80,000 तत्काल मारे गए।

Follow-up of cases found +ve during #PhaseOne was done by slide test to ensure that they had completed the treatment.
Dr Alice Hamilton, teacher there conducted research on it-She kept a culture plate on table while surgeon operated & spoke upto 500 words an average of 75 bacterial colonies were identified which contd Streptococci, Diplococci & other bacteria- half of them were harmful (2/4)