Why hygiene and sanitation matter

How can a child who recovers from every episode of diarrhoea still end up stunted? The answer lies in what repeated enteric infection does to the gut. A healthy small intestine is lined with finger-like villi that greatly increase the surface available for absorbing nutrients. Repeated infection with diarrhoeal pathogens flattens and damages those villi, a state described as environmental enteric dysfunction, so the same plate of food yields fewer nutrients. The gut wall also becomes leakier, allowing bacteria and their products to cross into the body and keep the immune system chronically inflamed. Appetite falls, and energy is spent fighting infection instead of growing. Because the first 1 000 days, from conception to the second birthday, are the fastest period of growth, damage during those years appears as stunting: a child who is too short for their age. Stunting is not only about height. It is associated with slower cognitive development, weaker school performance and lower adult earning capacity, so the harm outlives the diarrhoea. The relationship also runs in the other direction: a malnourished child has weaker defences, suffers longer and more severe episodes, and loses still more nutrients. Typhoid, caused by Salmonella Typhi and spread by contaminated water and food, travels the same faecal–oral route and can leave a chronic carrier state in the gall bladder, so a person who feels recovered may still contaminate food. Malaria follows a different mechanism: the Anopheles mosquito breeds in standing water, and blocked drains, poor wastewater management and discarded containers around a home create exactly that habitat. Understanding this chain dictates nursing action: plot weight and height on the growth chart, give oral rehydration salts with zinc, continue feeding during and after illness, and teach the household the water, sanitation and handwashing steps that prevent the next episode.

Why should a nurse treat social acceptance and self-esteem as health outcomes rather than as politeness? Because behaviour follows how people expect to be seen. Hygiene practices are strongly regulated by social norms — what a community treats as normal, clean or shameful. When a person cannot wash, cannot manage menstruation privately or cannot hide a smell, the usual reaction is shame and withdrawal: the pupil stops attending, the worker avoids colleagues, the patient conceals a problem from the nurse. Shame is a powerful motivator, but it is double-edged. Community-led total sanitation uses it deliberately: a community is helped to see its own open defecation and the disgust it produces, and then organises its own solution. Shaming individuals, by contrast, tends to produce denial and concealment rather than change. The more durable engine is self-efficacy, a term from the psychologist Albert Bandura meaning a person’s belief that they can carry out the behaviour and that it will work. Self-efficacy grows from small successes, from demonstration and from seeing people like oneself succeed. This is exactly why the lecture notes describe awareness as empowering: once a community knows its own water, sanitation and hygiene situation, it can plan and act, and each success raises confidence further. Menstrual hygiene is the clearest example, because soap, clean water, a private place to change and a safe way to dispose of pads convert a monthly reason for absence into ordinary school days, and the confidence gained reaches other parts of life. In practice, a nurse protects self-esteem by never shaming a patient for body odour, lice, incontinence or a dirty wound. She asks privately, explains the mechanism, supplies what is missing and treats the patient as a partner. Dignity is not a reward for good hygiene; it is part of how good hygiene is achieved.

Who actually gains when hygiene and sanitation improve, and why is prevention worth funding? The gains arrive at four levels, and each level sees a different saving. For the individual, the direct benefit is fewer infections and less time lost to illness — fewer school days for a child, fewer working days for an adult. For the household, the benefit is money not spent on consultations, medicines and transport, and the carer’s time not spent at a bedside. A household that keeps its food and water safe also protects its food security, which matters where ready-to-eat food from street vendors is a daily staple. For the community, the benefit is fewer outbreaks, water sources that remain safe for everyone, and the productivity and dignity of people who are not repeatedly ill. For the health system, the benefit is fewer outpatient consultations and admissions, fewer beds occupied by preventable illness, and staff time released for care that cannot be prevented. There is also an argument about resistance: every unnecessary course of antibiotics given for a diarrhoeal illness adds selection pressure, whereas hygiene prevents the illness instead of treating it. This is where the WASH logic matters. Water, sanitation and hygiene are delivered as one programme because they act together: a latrine without water and soap for handwashing produces less health gain than expected, and soap without a safe place to defecate leaves the environment contaminated. A programme that improves only one of the three asks the other two to compensate, and the weakest link sets the result. For nursing, the practical test is discharge planning: before sending a patient home, ask whether there is safe water, a functioning toilet and a way to wash hands, teach what the family can control, and refer what it cannot.