Keeping hands clean is one of the most important steps we can take to avoid getting sick and spreading germs to others. Many diseases and conditions are spread by not washing hands with soap and clean, running water.
How germs get onto hands and make people sick
Feces (poop) from people or animals is an important source of germs like Salmonella, E. coli O157, and norovirus that cause diarrhea, and it can spread some respiratory infections like adenovirus and hand-foot-mouth disease. These kinds of germs can get onto hands after people use the toilet or change a diaper, but also in less obvious ways, like after handling raw meats that have invisible amounts of animal poop on them. A single gram of human feces—which is about the weight of a paper clip—can contain one trillion germs 1. Germs can also get onto hands if people touch any object that has germs on it because someone coughed or sneezed on it or was touched by some other contaminated object. When these germs get onto hands and are not washed off, they can be passed from person to person and make people sick.
Washing hands prevents illnesses and spread of infections to others
Handwashing with soap removes germs from hands. This helps prevent infections because:
- People frequently touch their eyes, nose, and mouth without even realizing it. Germs can get into the body through the eyes, nose and mouth and make us sick.
- Germs from unwashed hands can get into foods and drinks while people prepare or consume them. Germs can multiply in some types of foods or drinks, under certain conditions, and make people sick.
- Germs from unwashed hands can be transferred to other objects, like handrails, table tops, or toys, and then transferred to another person’s hands.
- Removing germs through handwashing therefore helps prevent diarrhea and respiratory infections and may even help prevent skin and eye infections.
Teaching people about handwashing helps them and their communities stay healthy. Handwashing education in the community:
- Handwashing with soap could protect about 1 out of every 3 young children who get sick with diarrhea and almost 1 out of 5 young children with respiratory infections like pneumonia.
- Although people around the world clean their hands with water, very few use soap to wash their hands. Washing hands with soap removes germs much more effectively.
- Handwashing education and access to soap in schools can help improve attendance.
- Good handwashing early in life may help improve child development in some settings.
- Estimated global rates of handwashing after using the toilet are only 19% 6.
Handwashing helps battle the rise in antibiotic resistance
Preventing sickness reduces the number of antibiotics people use and the likelihood that antibiotic resistance will develop. Handwashing can prevent about 30% of diarrhea-related sicknesses and about 20% of respiratory infections (e.g., colds) . Antibiotics often are prescribed unnecessarily for these health issues. Reducing the number of these infections by washing hands frequently helps prevent the overuse of antibiotics—the single most important factor leading to antibiotic resistance around the world. Handwashing can also prevent people from getting sick with germs that are already resistant to antibiotics and that can be difficult to treat.
References
- Franks AH, Harmsen HJM, Raangs GC, Jansen GJ, Schut F, Welling GW. Variations of bacterial populations in human feces measured by fluorescent in situ hybridization with group-specific 16S rRNA-targeted oligonucleotide probes.external icon Appl Environ Microbiol. 1998;64(9):3336-3345.
- Ejemot RI, Ehiri JE, Meremikwu MM, Critchley JA. Hand washing for preventing diarrhoea.external icon Cochrane Database Syst Rev. 2008;1:CD004265.
- Aiello AE, Coulborn RM, Perez V, Larson EL. Effect of hand hygiene on infectious disease risk in the community setting: a meta-analysis.external icon Am J Public Health. 2008;98(8):1372-81.
- Huang DB, Zhou J. Effect of intensive handwashing in the prevention of diarrhoeal illness among patients with AIDS: a randomized controlled study.external icon J Med Microbiol. 2007;56(5):659-63.
- Rabie T and Curtis V. Handwashing and risk of respiratory infections: a quantitative systematic review.external icon Trop Med Int Health. 2006 Mar;11(3):258-67.
- Freeman MC, Stocks ME, Cumming O, Jeandron A, Higgins JPT, Wolf J et al. Hygiene and health: Systematic review of handwashing practices worldwide and update of health effects.external icon Trop Med Int Heal 2014; 19: 906–916.
- Wang Z, Lapinski M, Quilliam E, Jaykus LA, Fraser A. The effect of hand-hygiene interventions on infectious disease-associated absenteeism in elementary schools: A systematic literature review.external icon Am J Infect Control 2017; 45: 682–689.
- Liu L, Johnson HL, Cousens S, Perin J, Scott S, Lawn JE, Rudan I, Campbell H, Cibulskis R, Li M, Mathers C, Black RE; Child Health Epidemiology Reference Group of WHO and UNICEF. Global, regional, and national causes of child mortality: an updated systematic analysis for 2010 with time trends since 2000.external icon Lancet. 2012 Jun 9;379(9832):2151-61.
- Burton M, Cobb E, Donachie P, Judah G, Curtis V, Schmidt WP. The effect of handwashing with water or soap on bacterial contamination of hands.external icon Int J Environ Res Public Health. 2011 Jan;8(1):97-104.
- Azor-Martínez E, Cobos-Carrascosa E, Gimenez-Sanchez F, Martínez-López JM, Garrido-Fernández P, Santisteban-Martínez J, Seijas-Vazquez ML, Campos-Fernandez MA, Bonillo-Perales A. Effectiveness of a multifactorial handwashing program to reduce school absenteeism due to acute gastroenteritis.external icon Pediatr Infect Dis J. 2013 Oct 3.
- Lau CH, Springston EE, Sohn MW, Mason I, Gadola E, Damitz M, Gupta RS. Hand hygiene instruction decreases illness-related absenteeism in elementary schools: a prospective cohort study.external icon BMC Pediatr. 2012;12:52.
- Master D, Hess Longe SH, Dickson H. Scheduled hand washing in an elementary school population.external icon Fam Med. 1997;29(5):336-9.
- Bowen A, Agboatwalla M, Luby S, Tobery T, Ayers T, Hoekstra RM. Association between intensive handwashing promotion and child development in Karachi, Pakistan: a cluster randomized controlled trial.external icon Arch Pediatr Adolesc Med. 2012 Nov;166(11):1037-44.
- Hogerzeil H. Promoting rational prescribing: An international perspective. pdf icon[PDF – 6 pages]external icon Br J Clin Pharmacol. 1995;39:1-6.
Article by: https://www.cdc.gov/handwashing/why-handwashing.html
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