Influenza symptoms without cough

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Common Influenza Symptoms Without Cough

Cough and fever are the most predictive symptoms of influenza, but it is possible to have influenza without a cough. Several studies have examined which other symptoms are associated with influenza, especially in cases where cough is absent or not prominent.

Fever, Myalgia, Headache, and Nasal Congestion as Key Symptoms

Research consistently shows that fever is a strong indicator of influenza, even when cough is not present. Other symptoms that can occur with influenza include muscle pain (myalgia), headache, sore throat, and nasal congestion or runny nose (rhinorrhoea) Monto2000Monamele2020Wilson2021. In some studies, myalgia and headache were found to be significant predictors of influenza, sometimes even more so than cough . Nasal congestion is also commonly reported among those with influenza Monto2000Wilson2021.

Symptom Patterns in Different Populations

In older adults, feverishness, wheezing, and the timing of symptom onset (2-5 days after exposure) are also associated with influenza, even if cough is not present . However, many older adults with influenza do not meet the classic definition of influenza-like illness, which requires both cough and fever, indicating that influenza can present with atypical symptoms in this group .

Limitations of Symptom-Based Diagnosis

While cough and fever together are the most reliable predictors of influenza, relying solely on these symptoms can miss cases, especially in hospitalized patients or older adults. In these groups, the sensitivity and positive predictive value of symptom combinations (including cough and fever) are low, meaning that many cases of influenza may not be identified if only these symptoms are considered . Other symptoms like chills, obstructed nose, and general malaise may also be present and should be considered .

Conclusion

Although cough is a common and strong predictor of influenza, it is not always present. Fever, myalgia, headache, sore throat, and nasal congestion are also important symptoms that can indicate influenza infection, especially when cough is absent. In older adults and hospitalized patients, influenza may present with atypical symptoms, so clinicians should consider a broader range of symptoms when diagnosing influenza without cough Monto2000Lam2016Monamele2020+2 MORE.

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Most relevant research papers on this topic

Clinical signs and symptoms predicting influenza infection.

Cough and fever within 48 hours of symptom onset are the best predictors of influenza infection, suggesting antiviral therapy may be appropriate for these patients.

Meta-Analysis

2000·

345citations

·A. Monto et al.

Archives of internal medicine·

DOI

Predictors of influenza among older adults in the emergency department

Cough and feverishness are the most predictive symptoms of influenza in older adults, with current influenza-like illness definitions not adequately capturing the illness.

Rigorous Journal

2016·

47citations

·Po-Po Lam et al.

BMC Infectious Diseases·

DOI

Clinical signs predictive of influenza virus infection in Cameroon

Cough, rhinorrhoea, headache, and myalgia are significant predictors of influenza infection in Cameroon, with myalgia having a 2-fold higher value than other symptoms.

Rigorous Journal

2020·

8citations

·C. Monamele et al.

PLoS ONE·

DOI

Flu

Influenza is caused by viruses and can be treated with fever-reducing drugs, increased fluid intake, and rest, while secondary infections may require antibiotics.

Literature Review

2021·

0citations

·Michael Wilson et al.

Close Encounters of the Microbial Kind·

DOI

Predicting influenza infections during epidemics with use of a clinical case definition.

A clinical case definition including fever (temperature of >38 degrees C) and cough effectively predicted influenza infections during the 1998-1999 flu season, with 86.8% positive predictive value, 39.3% negative predictive value, 77.6% sensitivity, and 55.0% specificity.

2000·

369citations

·G. Boivin et al.

Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·

DOI

Symptoms of Influenza Virus Infection in Hospitalized Patients

Fever, cough, and other symptoms have low sensitivity and positive predictive value for diagnosing influenza virus infection in hospitalized patients, making their use for treatment decisions and infection control management insufficient.

2008·

56citations

·C. V. D. Dool et al.

Infection Control & Hospital Epidemiology·

DOI

Working towards a simple case definition for influenza surveillance.

The symptom complex of cough, fever, and fatigue is the most effective single case definition for influenza-like illness in influenza surveillance, with laboratory confirmation still needed for accurate identification.

2003·

136citations

·Karin A Thursky et al.

Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology·

DOI

Symptomatic predictors of influenza virus positivity in children during the influenza season.

During the influenza season, cough and fever are the best symptomatic predictors of influenza virus infection in children aged 5-12 years, but not in those 1-4 years of age.

Rigorous Journal

2006·

111citations

·S. Ohmit et al.

Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·

DOI

Measurements of Airborne Influenza Virus in Aerosol Particles from Human Coughs

Coughing by influenza patients emits aerosol particles containing influenza virus, suggesting the airborne route may be a pathway for influenza transmission.

2010·

432citations

·W. Lindsley et al.

PLoS ONE·

DOI

Understanding the symptoms of the common cold and influenza

New knowledge of cytokines helps explain some previously folkloric symptoms of colds and flu, improving our understanding of their mechanisms.

Literature Review

2005·

577citations

·R. Eccles

The Lancet. Infectious Diseases·

DOI

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