Respiratory Virus Surge: Diagnosing COVID-19 vs RSV, Flu

January 25, 2024 – Amid the present wave of winter respiratory virus circumstances, influenza (sorts A and B) leads the best way with the best variety of emergency room visits, adopted intently by COVID-19, due to the JN.1 variant, and respiratory syncytial virus (RSV). With numerous similarities and variations in illness displays, how difficult is it for doctor’s to tell apart between, diagnose, and deal with COVID-19 vs RSV and influenza? 

Whereas these three respiratory viruses usually have comparable displays, you might usually discover that sufferers with COVID-19 expertise extra fever, dry cough, and labored respiratory, in keeping with Cyrus Munguti, MD, assistant professor of drugs at KU Medical Middle and hospitalist at Wesley Medical Middle, Wichita, Kansas. 

“COVID-19 sufferers are likely to have hassle respiratory as a result of the alveoli are affected and get irritation and fluid accumulating within the lungs, they usually find yourself having little to no oxygen,” stated Munguti. “After we test their very important indicators, sufferers with COVID are likely to have hypoxemia [meaning saturations are less than 88% or 90% depending on the guidelines you follow].”

Sufferers with RSV and influenza are likely to have extra higher respiratory signs, like runny nostril, sternutation — which later can progress to a cough within the higher airways, Munguti stated. In contrast to with COVID-19, sufferers with RSV and influenza — usually till they’re very sick — usually don’t expertise hypoxemia.

Irritation within the airways can kind because of all three viruses. Moreover, micro organism that dwell in these airways may result in a secondary bacterial an infection within the higher respiratory and decrease respiratory tracts — which may then trigger pneumonia, Munguti stated.

One other word: Adjustments in COVID-19 variants through the years have made it more and more tough to distinguish COVID-19 signs from these of RSV and influenza, in keeping with Panagis Galiatsatos, MD, pulmonologist and affiliate professor at Johns Hopkins Medication. “The Alpha via Delta variants actually had been much more lung tissue invading,” Galiatsatos stated. “With the COVID-19 Omicron household — its capabilities are just like what flu and RSV have finished through the years. It is extra airway-invading.”

It is vital to know that diagnosing these illnesses primarily based on signs alone could be fairly fickle, in keeping with Galiatsatos. Goal assessments, both at residence or in a laboratory, are most well-liked. That is largely as a result of illness presentation can depend upon the host issue that the virus enters into, stated Galiatsatos. For instance, virus signs might look completely different for a affected person with bronchial asthma and for somebody with coronary heart illness.

With kids being among the many most weak for extreme respiratory sickness, testing and remedy are paramount and could be fairly correct in seasons the place respiratory viruses thrive, in keeping with Stan Spinner, MD, chief medical officer at Texas Youngsters’s Pediatrics and Pressing Care. “When people are examined for both of those circumstances when the prevalence in the neighborhood is low, we are likely to see false constructive outcomes.” 

Texas Youngsters’s Pediatrics and Pressing Care’s 12 websites supply COVID-19 and influenza antigen assessments which have outcomes prepared in round 10 minutes. RSV testing, then again, is proscribed to round half of the Texas Youngsters’s Pediatrics and not one of the pressing care places, because the take a look at can solely be administered via a nasal swab carried out by a doctor. As there is no such thing as a particular remedy or remedy for RSV, the advantages of RSV testing can truly be fairly low — usually resulting in annoyed dad and mom concerning subsequent steps after prognosis.

“There are a variety of respiratory viruses which will current with comparable signs as RSV, and a few of these viruses might even result in a lot of the identical opposed outcomes because the RSV virus,” Galiatsatos stated. “Consequently, our physicians want to assist dad and mom perceive this and provides them steerage as to when to hunt medical consideration for worsening signs.”

There are two new RSV immunizations to deal with sure demographics of sufferers, Spinner added. One is an RSV vaccine for infants beneath 8 months outdated, although there’s restricted provide. There’s additionally an RSV vaccine accessible for pregnant ladies (between 32 and 36 weeks gestation) that has confirmed to be efficient in heading off RSV infections in newborns as much as 6 months outdated. 

Physicians ought to stay diligent in stressing to sufferers that vaccinations towards COVID-19 and influenza play a key function in retaining their households protected throughout seasons of staggering respiratory infections.

“These vaccines are extraordinarily protected, and whereas they might not at all times forestall an infection, these vaccines are extraordinarily efficient in stopping extra critical penalties, similar to hospitalization or demise,” Galiatsatos stated.