Vomiting symptoms in influenza
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Vomiting Symptoms in Influenza: Prevalence and Demographics
Vomiting is a recognized symptom of influenza, especially in children. Studies consistently report that children with influenza are more likely to experience vomiting compared to those without the infection, and this symptom is more common in younger age groups than in adults Pongsumpun2020Yu2018Janfeb2021+3 MORE. In one large pediatric study, vomiting was significantly more prevalent among influenza-positive children than those who tested negative for the virus . Similarly, vomiting and other gastrointestinal symptoms such as diarrhea and nausea are frequently observed in children with influenza, while adults are less likely to report these symptoms Pongsumpun2020Janfeb20217+1 MORE.
Vomiting in Special Populations: Pregnancy and Hospitalized Patients
Pregnant women with influenza also commonly report vomiting. In a prospective study of pregnant women with laboratory-confirmed influenza A, 60% experienced nausea or vomiting as part of their illness . Hospitalized patients at the extremes of age (young children and the elderly) or with underlying health conditions are more likely to present with both respiratory and gastrointestinal symptoms, including vomiting .
Mechanisms and Viral Presence in the Gastrointestinal Tract
Research has shown that influenza virus can be detected in stool samples of patients with concurrent respiratory and gastrointestinal symptoms, suggesting that the virus may localize in the gastrointestinal tract and contribute to vomiting and diarrhea, particularly in children Chan2009Dilantika2010. Animal studies indicate that influenza infection can alter the gut microbiota and immune responses, which may further explain the occurrence of gastrointestinal symptoms like vomiting during influenza infection .
Impact of Antiviral Treatment on Vomiting
The use of neuraminidase inhibitors, such as oseltamivir (Tamiflu), for treating influenza has been associated with an increased risk of vomiting, especially in children. Clinical trials and systematic reviews have found that oseltamivir treatment increases the risk of vomiting in both adults and children compared to placebo . This side effect should be considered when weighing the benefits and harms of antiviral therapy for influenza.
Conclusion
Vomiting is a well-documented symptom of influenza, particularly in children, pregnant women, and hospitalized patients with comorbidities. The presence of the virus in the gastrointestinal tract and the effects of antiviral medications can contribute to this symptom. While vomiting is less common in adults, it remains an important clinical feature of influenza in certain populations and should be considered in diagnosis and management.
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Most relevant research papers on this topic
Neuraminidase inhibitors for influenza: a systematic review and meta-analysis of regulatory and mortality data.
Oseltamivir and zanamivir effectively treat and prevent influenza in adults, but may increase the risk of nausea and vomiting.
Fecal detection of influenza A virus in patients with concurrent respiratory and gastrointestinal symptoms.
Influenza A viral RNA can be detected in stool specimens of high-risk patients with concurrent respiratory and gastrointestinal symptoms.
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