Although Ruchi had been suffering from cold and cough,yet She decided to appear for her unit test Neeta seated next to her was not affected but pooja seating behind contracted the infication a) What prevented Neeta catching cold and cough inspite of her exposeme to the infiction.
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If Neeta was unaffected, it was due to immunity to the particular flu virus. Neeta could have gained immunity through vaccination or from previous exposure to that particular virus. What this means is that she already had the antibodies for the flu virus in her immune system, thus when she was exposed to the virus, her immune system was able to launch an immediate effective attack, which prevented her from getting sick.
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