Causes of acute watery diarrhea
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Infectious Causes of Acute Watery Diarrhea
Acute watery diarrhea is most commonly caused by infectious agents, including viruses, bacteria, and parasites. Among these, rotavirus is consistently identified as the leading cause, especially in children under five years old, across multiple global studies and surveillance networks Iyoha2015Ayalew2020Lawn2003+1 MORE. Other viral agents, such as norovirus, can also contribute, but rotavirus remains the most significant, even in areas where vaccination programs have been implemented Iyoha2015Lawn2003Farthing2000.
Bacterial pathogens are also important contributors. Common bacterial causes include Escherichia coli, Salmonella species, Shigella species, Vibrio cholerae, Campylobacter jejuni, and Aeromonas species Habib2021Meisenheimer2022Siciliano2020+1 MORE. Vibrio cholerae, in particular, is associated with large outbreaks and is a well-known cause of cholera, a severe form of acute watery diarrhea Angom2021Habib2021Meisenheimer2022+1 MORE.
Parasitic infections, though less common, can also cause acute watery diarrhea. Notably, acute hookworm infection has been reported as a rare cause, particularly in travelers Serrano2022Meisenheimer2022.
Risk Factors and Transmission of Acute Watery Diarrhea
Several risk factors increase the likelihood of developing acute watery diarrhea. Poor hand hygiene, consumption of contaminated water (especially from rivers), eating raw fruits and vegetables, and lack of proper sanitation facilities are all strongly associated with outbreaks Angom2021Siciliano2020. In children, lack of exclusive breastfeeding in the first six months, lower maternal education, and lower household income are additional risk factors .
Transmission typically occurs via the fecal-oral route, often through contaminated food or water, or direct person-to-person contact, especially in settings with inadequate sanitation and hygiene Angom2021Meisenheimer2022Siciliano2020.
Clinical Features and Diagnosis
Acute watery diarrhea is characterized by the sudden onset of frequent, loose, or watery stools, often accompanied by vomiting and sometimes fever Lawn2003Farthing2000. Dehydration and electrolyte imbalances are common complications, particularly in young children Lawn2003Farthing2000. Most cases are self-limiting and resolve within a few days, but severe cases, especially those caused by cholera or in vulnerable populations, can be life-threatening if not managed promptly Meisenheimer2022Siciliano2020Van Chuc2023.
Diagnosis is primarily clinical, but laboratory testing (such as PCR, ELISA, or stool cultures) can help identify the specific pathogen, especially in severe or outbreak situations Iyoha2015Ayalew2020Meisenheimer2022+2 MORE.
Prevention and Control
Effective prevention strategies include improving hand hygiene, ensuring access to safe drinking water, promoting exclusive breastfeeding for infants, and maintaining proper sanitation Angom2021Siciliano2020Farthing2000. Vaccination against rotavirus has significantly reduced the burden of disease in many countries, but rotavirus remains a leading cause where vaccine coverage is incomplete Iyoha2015Ayalew2020Lawn2003+1 MORE.
Conclusion
Acute watery diarrhea is most often caused by infectious agents, with rotavirus being the leading cause in children, followed by various bacteria and, less commonly, parasites. Poor hygiene, unsafe water, and inadequate sanitation are key risk factors. Prevention focuses on vaccination, hygiene, and improved water and sanitation infrastructure. Most cases are self-limiting, but severe cases require prompt rehydration and supportive care.
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