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*Corresponding Author: Uday Jain, Department of Anesthesiology, San Mateo Medical Center, San Mateo, California.
Citation: Jain U. (2022), Influenza Persists. J. Gastroenterology Pancreatology and Hepatobilary Disorders. 6(2) DOI: 10.31579/2641-5194/057
Copyright: © 2022, Uday Jain, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 11 November 2021 | Accepted: 10 December 2021 | Published: 08 January 2022
Keywords: influenza A viruses ; influenza B viruses; COVID-19; sepsis; meningitis
In the US, influenza (flu) causes 9 to 45 million illnesses, leading to 12,000 to 61,000 deaths annually (10.1001/jama.2020.14772).
World Health Organization estimates that worldwide annually there are about one billion infections, 3-5 million severe illnesses, and 300,000-500,000 deaths (10.1038/s41572-018-0002-y). Influenza is caused primarily by influenza A and influenza B viruses. Influenza A is the cause of pandemics. A schematic diagram of influenza A virus is presented in Figure 1. Influenza will continue to be prevalent because its current vaccines are safe but only 30-60
Since the start of COVID-19 pandemic, influenza is of greater concern. Overlapping spread of both diseases is a major strain on the health care system. Their coinfection is not common but may cause more severe disease. Influenza vaccination and therapy are important in addition to COVID-19 vaccination and therapy, especially in persons at increased risk.
Influenza’s median incubation period is 2 days. Patients are infectious for a day before and 5 to 7 days after symptoms. COVID-19 has an incubation period of 4-12 days, a median of about 5 days. Patients are most infectious from 2 days before symptom onset. Influenza symptoms peak in 3-7 days. COVID-19 symptoms peak in second or third week. The spread of both viruses is facilitated by transmission by asymptomatic patients.
About one-half of influenza A cases are due to aerosol transmission (10.1038/s41598-019-38825-y). Adequate ventilation can reduce it. Precautions utilized during the COVID-19 pandemic reduced the incidence of influenza in 2020. Used appropriately, surgical masks reduce the concentration of aerosolized influenza virus by about ten-fold and are adequate for prophylaxis against influenza (10.1016/j.jhin.2013.02.007; 10.7326/M20-3213). Transmission by respiratory droplets can also be reduced by masking. Transmission by direct contact can be reduced by hand and general hygiene. COVID-19 is transmitted in a similar manner. Social distancing reduces transmission by all the mechanisms.
Influenza is less contagious and causes less severe disease than COVID-19. Quarantine recommended for COVID-19 patients is not necessary for those with influenza. Children play an important role in transmitting influenza. Healthcare providers should take precautions to avoid infecting themselves and others.
The Centers for Disease Control define ILI as fever 100°F (38°C) or greater and cough or sour throat that is not due to another known cause including streptococcal pharyngitis (strep throat). ILI’s causes can be benign such as common cold (nasopharyngitis caused by rhinovirus or other viruses) or severe including sepsis, meningitis, COVID-19, and SARS. Often there is an abrupt onset. SARS leads to severe disease in most of the infected. Influenza and COVID-19 cause mild disease in most of the infected (10.1016/S1473-3099(20)30484-9). SARS is currently not prevalent. Severe disease due to COVID-19 and SARS occurs primarily in the elderly. Influenza is more evenly distributed across the age groups. ILI can cause immunosuppression, leading to bacterial pneumonia, necessitating antibiotics (10.1097/QCO.0000000000000347).
After general anesthesia, children with influenza have a longer hospital length of stay and increased risk of requiring intensive care (10.1186/1471-2253-11-16). Routine surgery should be postponed for about four weeks in a patient with ILI. Unvaccinated patient should be offered influenza vaccination after the acute phase of ILI has passed and before the surgery. Before performing urgent surgery, severe causes of ILI should be excluded.
In cold weather URI is common, especially in children. Often it is due to common cold, or noninfectious allergic or vasomotor rhinitis. Less commonly, it can be early presentation of more serious illness including ILI, COVID-19, strep throat, and herpes simplex. Early in infection it is difficult to distinguish between different etiologies of URI.
URI may cause sneezing, coughing, headache, malaise, rhinorrhea, sore throat, sinusitis, and bronchitis. Subsequently, bronchi may be hyperreactive for about six weeks.
Pulmonary complications associated with surgery in a patient with URI are bronchospasm, laryngospasm, coughing, breath holding, postintubation croup, episodes of desaturation, atelectasis, and pneumonia. Anticholinergics and bronchodilators may not be beneficial. Perioperatively, adequate hydration and humidification should be maintained. There are no pediatric or adult anesthesia closed claims that implicate URIs including influenza with serious adverse events.
There is a very small incidence of viral myocarditis in patients with URI including ILI. It may lead to serious arrhythmias and refractory heart failure (10.1016/j.jcrc.2018.06.001; 10.1038/s41569-020-00435-x).
These include nucleic acid amplification via polymerase chain reaction (PCR) and antigen-based immunological assays. A PCR test can be performed even at the point-of-care with results available within an hour (10.1016/S2213-2600(20)30469-0). This can facilitate infection control and utilization of antiviral therapeutics. It is especially useful for patients who have severe symptoms or are hospitalized. Test for COVID-19 may also be performed if indicated.
It is the best preventive measure. Although not very efficacious, it substantially reduces morbidity and mortality because of high prevalence of influenza. It is recommended for anyone over 6 months of age. It is especially beneficial in the presence of age <2>65 years, pregnancy, and pre-existing conditions (10.1001/jama.2020.14772). Lack of vaccination in pregnancy not only increases the risk to mother but also increases the risk of preterm birth, fetal death, infant respiratory infection and hospital admission.
The T cell response vaccines elicit is substantially weaker than the antibody response. Children may need two doses of vaccine, at least four weeks apart. The vaccine should be administered at least one week before surgery. It takes two weeks to develop full effect. As the protection wanes over time, mid-September to mid-October is preferred for vaccination. Influenza and COVID-19 vaccines may be administered together. The vaccine may be administered to surgical inpatients (10.7326/M15-1667).
The influenza virus mutates frequently. Quadrivalent vaccines protect against four of the currently most prevalent strains of influenza. The vaccines are altered every year for the predicted prevalent strains.
Nine vaccines from four manufacturers are available in the US. Inactivated influenza vaccine is most commonly used. It is approved for persons above 6 months of age. As older individuals have a reduced response, vaccines that have a higher dose or are adjuvanted are recommended for persons above 65 years of age. The vaccine is usually administered intramuscular, but a lower dose intradermal vaccine is non-inferior (10.1001/jamanetworkopen.2020.35693).
Live-attenuated influenza vaccine is administered via nasal spray. It is approved for ages 2-49 years. It may be preferable in some situations such as vaccinating many persons in a community. It should be avoided if the patient or someone nearby has a suppressed immune system. Hence, it is not suitable for inpatients.
Recombinant vaccine and cell culture vaccine do not contain egg products. They are especially suitable for persons who need to avoid eggs because of allergy or dietary preferences.
Universal vaccines that provide durable response against all influenza strains are in human trials (10.1038/s41591-020-1118-7). These vaccines generate antibodies against the viral hemagglutinin protein stem (stalk) domain (HA2). Current vaccines generate antibodies against the immunodominant globular head domain (HA1), which is variable and mutates much more frequently.
Vaccines utilizing mRNA are also in human trials. They are likely to have greater efficacy but more side effects than current vaccines. A major advantage of the mRNA vaccines is that they can be readily modified to match mutations in the virus.
Influenza vaccine reduces the risk of respiratory and cardiovascular adverse outcomes and mortality among adults, especially in the presence of pre-existing conditions and advanced age. This was confirmed in a meta-analysis of studies on all adults (10.1016/j.arr.2020.101124). Another meta-analysis found that vaccine reduced the risk of adverse cardiac outcomes, especially in sicker patients (10.1001/jama.2013.279206).
Preoperative vaccination is beneficial. A large study of elderly patients who had major surgery found preoperative vaccination reduced by about one-half the risk of pneumonia, intensive care admission, and death (10.1093/infdis/jix616). Patients also had shorter hospital stays and reduced resource utilization.
These include neuraminidase inhibitors oseltamivir, zanamivir, peramivir, and laninamivir; cap-dependent endonuclease inhibitor baloxavir; and matrix protein M2 ion channel blockers (10.1001/jamanetworkopen.2021.19151). They attenuate viral replication. They provide postexposure prophylaxis. When started within 2 days of symptom onset, they reduce duration and severity of the disease, and complications. They also reduce transmission of influenza virus. However, their efficacy is limited, especially in patients with serious illness. They are expensive and not widely utilized.
Although influenza and COVID-19 have similar initial symptoms, their therapeutics are different. Thus, dexamethasone reduces mortality for hospitalized COVID-19 patients on respiratory support but may increase mortality for hospitalized influenza patients (10.1001/jama.2020.15260).
They are usually caused by zoonotic influenza A virus strains migrating to humans. The 1918 “Spanish flu” pandemic caused by influenza A H1N1 virus led to more than 40 million deaths worldwide. H1 denotes haemagglutinin subtype 1 and N1 denotes neuraminidase subtype 1. The pandemics of 1957, 1968 and 2009 were caused by influenza A H2N2, H3N2, and H1N1 viruses, respectively. The 2009 “swine flu” influenza A H1N1 virus that originated from pigs was antigenically different from previously dominant influenza A H1N1 viruses. It caused 150,000-600,000 deaths worldwide. Avian influenza “bird flu” caused by H5N1 and H7N9 is not prevalent. Overlapping occurrence of influenza pandemic and COVID-19 will be devastating. Vigilance and prompt action are essential to prevent zoonotic influenza A virus strains from migrating to humans.
Influenza is a prevalent respiratory disease that will continue to affect anesthesia practice in the foreseeable future. With appropriate management, the risk of adverse outcomes is low. Vaccination is highly recommended, especially preoperatively.
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