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Seasonal Illness

Flu season is here. Here is what is going around.

Lab tests across the Northeast show flu, adenovirus and stomach bugs on the rise. Here is what we are seeing and simple ways to keep your family healthy.

Flu A, nasal swab tests

1 in 9 tests positive

More than double the week before. Four weeks ago it was fewer than 1 in 60.

1.5%

Oct 4

4.0%

Oct 11

4.7%

Oct 18

11.1%

Oct 25

On the rise

Each bar is the share of regional lab tests that came back positive, one bar per week. The last bar is the most recent week.

Adenovirus

Up 4 weeks in a row

A common virus behind colds, sore throats, fever and pink eye.

33.6% of nasal swab tests last week

21.3%

Oct 4

24.7%

Oct 11

30.2%

Oct 18

33.6%

Oct 25

SymptomsCold symptoms, sore throat, fever, pink eye, cough

Flu (Influenza A)

Up 4 weeks in a row

Mostly the H1 strain, one of the strains in every year flu shot.

11.1% of nasal swab tests last week

1.5%

Oct 4

4.0%

Oct 11

4.7%

Oct 18

11.1%

Oct 25

SymptomsFever, chills, cough, sore throat, body aches, tiredness

C. diff

Holding at its high

A bacterial gut infection often linked to recent antibiotic use.

18.0% of stomach-illness tests last week

16.5%

Oct 4

15.1%

Oct 11

18.0%

Oct 18

18.0%

Oct 25

SymptomsWatery diarrhea 3 or more times a day, belly pain, fever

Norovirus

Highest in 4 weeks

The stomach bug. Spreads fast in homes, schools and offices.

16.2% of stomach-illness tests last week

9.2%

Oct 4

12.8%

Oct 11

12.2%

Oct 18

16.2%

Oct 25

SymptomsSudden vomiting, diarrhea, nausea, cramps for 1 to 3 days

COVID-19

1.7%

Lowest in 4 weeks

RSV

0%

Not detected in 2 weeks

Strep throat

13.3%

Steady at its usual level

Four simple ways to protect yourself

  • Get your flu shotRecommended every year for everyone 6 months and older. It is not too late.
  • Wash with soap and waterScrub for at least 20 seconds. It works against all four germs on this page.
  • Stay home when sickWait until you have been fever-free for 24 hours without fever medicine.
  • Call us earlyFlu medicine works best when started within 48 hours of symptoms.

Soap or hand sanitizer?

Hand sanitizer is handy, but some of this season germs shrug it off. When in doubt, use soap and water.

Germ Soap and water Hand sanitizer
Flu Works Works
Adenovirus Works Less reliable
Norovirus Works Less reliable
C. diff Works Does not work

When to call us

Most of these illnesses get better on their own. Call the office if you notice any of the following.

  • FluWithin 48 hours of symptoms, especially if you are 65 or older, pregnant, have a chronic condition, or for young children.
  • AdenovirusTrouble breathing, a fever lasting more than 3 days, or eye pain or redness that gets worse.
  • NorovirusSigns of dehydration: very little urine, dizziness or a dry mouth, especially in young children and older adults.
  • C. diffDiarrhea 3 or more times a day for 2 or more days, especially during or after a course of antibiotics.

Percentages are the share of lab tests run across the Northeast US that detected each germ, from BioFire FilmArray regional trend reports for the weeks starting Oct 4, Oct 11, Oct 18 and Oct 25, 2026. Flu and adenovirus figures are from nasal swab tests. They are regional numbers, not GMP patient counts. This page is general health information, not medical advice. Contact your provider about your own symptoms.

Questions about your own symptoms? Call the office at (203) 661-2596.