Infection is defined as lodgment and multiplication of a microorganism in or on the tissues of a host. An infection need not always result in a disease.
Source of infection: Humans (commonest), food and food products, animals and birds, insects, soil, and water.
Mode of spread: Contact (Commonest), inhalation, ingestion, inoculation (injections, blood transfusion), vectors (mosquitoes, flies etc), congenital (from pregnant lady to fetus), iatrogenic (due to medical procedures).
Contact with contaminated surfaces like desk, pens, door handles, tap handles, towels etc. is the easiest way of transmission of infection. Common cold (caused by a virus) is transmitted commonly by contact. Places like School, public places, offices etc. are places where humans can get infected. Even at home coming in contact with contaminated surfaces can spread infection. Infections can spread more effectively by contact than acts like sneezing or coughing. Commonly seen viral conjunctivitis (Madras eye) also spread by contact with contaminated surfaces and not by just seeing someone’s red eye. When a patient with viral conjunctivitis rubs fingers on eyes virus gets carried in hands and when they touch surfaces like table, door handles, towels etc. they can spread disease to those who come in contact with it. However such type of infections can be easily prevented by a simple method, “Hand washing”.
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What happens when we cough or sneeze? Aerosols are created in the surroundings. The droplets may contain microbes which will sit on surfaces and hands. When a normal person comes in contact like touching the surfaces, shaking hands etc. the infection will spread to them.
When and how to wash hands? Hand washing must be effective and serve the purpose. Hand washing must be done before and after having food, after acts like sneezing or coughing, nose picking, cleaning ears, using toilet, before and after coming in contact with patients.
For everyday purpose hand washing should be done with clean water with soap. Soaps can be solid soaps and liquid soap. Some soaps are medicated (like dettol, savlon etc). Liquid medicated soaps are ideal for washing hands. Solid soaps have a disadvantage of getting contaminated after long use when multiple people use it. Ordinary soaps act the reducing surface tension and make the microbes and dirt to be washed away. They don’t kill the microbes. Medicated soaps have antiseptics like chlorhexidine, triclosan etc which can kill majority of harmful bacteria, viruses etc. Liquid medicated soaps are highly recommended for washing hands.
Method of washing. First take soap solution, spread on palms, moisten with water, rub the palms, then back of hand, fingers and knuckles, thumbs, finger tips and wrist. Commonly missed areas while washing hands are thumbs, web space & tips of fingers.
While washing hands with soap wash for at least 60 seconds or sing ABCD-Z twice or happy birthday song once in your mind.
Alcohol based hand rubs (containing ethyl alcohol or ethanol 70-80%) are the best. Hand washing with hand rubs takes about 20 seconds. But it’s used commonly in hospitals, clinical laboratories and some food industries. It can be also used at home, but expensive than soap.
Request your doctor to wash hands before examining you or your relative, if he has not done so.
To conclude regular and effective hand washing is the best and the cheapest method of preventing most infections.
About the Author:
Dr. Anup Kumar Shetty is working as the Assistant Professor, Department of Microbiology, at Father Muller Medical College, Kankanady, Mangalore. Diagnostic molecular biology, Immunology and Clinical microbiology are his fields of interest. He obtained his MBBS, from KMC, Mangalore, and MD (Microbiology), from KMC, Manipal.
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