If it feels like everyone you know is getting sick, that’s because they are. The Bay Area is getting pummeled with a triple threat of viruses.
COVID-19, flu, and respiratory syncytial virus cases are surging across the region and the nation, making it harder than ever to determine what is causing your dry cough or runny nose. The infections cause similar symptoms, but it’s important to know how to tell them apart to get proper treatment and avoid spreading them to others.
“Distinguishing COVID from flu can be difficult because the symptoms overlap so much,” said Dr. Brooke Bozick, an expert on respiratory diseases with the National Institutes of Health.
COVID-19 shares several common symptoms with the flu — including fever, dry cough, body aches and fatigue, according to the Centers for Disease Control and Prevention. But many familiar indicators of a coronavirus infection have evolved as newer variants emerge and immunity from vaccination or prior infection increases.
“As our bodies become more experienced with COVID, the symptoms are milder overall,” said Peter Chin-Hong, an infectious disease expert at UCSF.
A runny nose, headache or sore throat could now precede a positive coronavirus test result with one of the many offshoots of omicron, while the flu usually begins with a cough. Signs of a common cold can include sneezing, runny nose and watery eyes.
Some COVID indicators reported during earlier phases of the pandemic, such as loss of taste and smell, are less common now.
People infected with the flu typically develop symptoms about one to four days after infection. COVID-19 symptoms develop three to four days after being infected, but some people can show signs as early as two days or as late as 14 days after infection.
RSV, which mainly affects children and seniors, typically causes mild, cold-like symptoms — like runny nose, coughing or wheezing — from which most people will recover quickly. In infants under 6 months old, the only indicators of RSV might be irritability, decreased activity and appetite and pauses in breathing, per the CDC.
But RSV can also lead to more severe infections like bronchiolitis or pneumonia, with such outcomes more likely among the youngest and oldest patients.
Testing is recommended to diagnose the specific virus, but here are some common symptoms to help you determine what’s making you sick.
Common COVID-19 symptoms
People with COVID-19 have had a wide range of symptoms reported — from a runny nose to severe illness. Symptoms may appear two to 14 days after exposure to the virus, according to the CDC. Here are some of the most common.
• Fever, chills
• Headache
• Cough, dry cough
• Body aches or or muscle pain
• Fatigue
• Stuffy or runny nose
• Sore throat
• Difficulty breathing, shortness of breath
Common influenza (flu) symptoms
Flu symptoms usually come on suddenly, and people who are sick can feel some or all of these symptoms.
• Fever, chills
• Headache
• Cough
• Body aches or or muscle pain
• Fatigue
Respiratory Syncytial Virus Infection (RSV) symptoms
People infected with RSV usually show symptoms within four to six days after getting infected. Symptoms of RSV infection usually include the following.
• Fever (low grade)
• Headache
• Cough
• Stuffy or runny nose
• Loss of appetite
• Sneezing
Common cold symptoms
Symptoms of a cold usually peak within 2 to 3 days and can include the following.
• Cough
• Stuffy or runny nose
• Sore throat
• Sneezing
It is possible to get infected by more than one of the circulating viruses at the same time, said Dr. Mark Ghaly, secretary of the California Health & Human Services Agency.
“We’re talking about these infections as independent actors, as though people who get one virus at one time, can’t get another virus at the exact same time — or sometimes even worse, a bacterial infection — and this is certainly not the case,” he said. “Some of the hardest times that I’ve faced as a clinician is when kids who are infected with one virus come in with a second on top of that. They’re not just additive. It’s such a strain on one’s immune system that the situation often looks worse.”
You should seek emergency medical attention for more severe symptoms, whether caused by a single infection or a “super infection.” These include trouble breathing, persistent pain or pressure in the chest, new confusion, the inability to wake up or stay awake, or discoloration of the skin, lips, or nail beds,
Public health experts say vaccination is the first line of defense against avoiding symptomatic infection. While vaccines for flu and COVID-19 are widely available, there are no shots available to prevent RSV. “The power of vaccines to reduce not just the likelihood that you get infected altogether, but the likelihood of severe disease is real,” Ghaly said.
A proportion of people who get COVID-19 can experience persistent symptoms that last weeks or even months after the initial infection.
About 200 symptoms of so-called long COVID have been identified to date, with a list maintained by the CDC highlighting 20 of the most commonly reported. These range from fatigue and heart palpitations to neurological complications and digestive disorders.
Bay Area residents should follow the familiar preventative measures to curb the spread of all of the viruses. That includes wearing high-quality masks when indoors, washing their hands often, and staying home when sick.
There are also several treatments available for those who are experiencing symptoms, including Tamiflu for influenza and Paxlovid for those who are at high risk for severe COVID-19.
“Getting treatment as quickly as possible if indicated is a key step,” Ghaly said.
Aidin Vaziri is a San Francisco Chronicle staff writer. Email: avaziri@sfchronicle.com