Last Friday, Public Health Officer Dr. Matt Willis sent the advisory and noted that the county's Department of Health and Human Services had investigated 77 cases of whooping cough, or pertussis, since December.
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On Thursday, the department said 36 additional cases have come to light.
RELATED: How to protect your family from whooping cough
"So far, Marin County has investigated 113 cases of Pertussis from mid-December to today. Most of the cases are clustered in the South Marin area, including an outbreak at Tamalpais High School with (more than) 65 cases identified," the county's Senior Public Health Nurse Lindsey Termini said in an email. "Pertussis typically surges every 3-5 years. The last surge in Marin County was in 2018, with >300 cases in the community identified."
As of Thursday, there were no reported cases of hospitalizations due to whooping cough in the county and no reported infant cases.
"We are working closely with Tam High to help mitigate spread by releasing exposure notifications," Termini said.
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She said that the infection spreads easily from person to person through droplets in the air and is usually milder in teens and adults than in babies and children, especially those vaccinated against whooping cough.
Symptoms can seem like the common cold and include fatigue, runny nose, sneezing and a mild cough that can eventually progress to severe coughing fits.
It's also not uncommon for high school-aged adolescents to contract the illness at higher rates since their childhood whooping cough vaccinations are becoming less effective.
MORE: Study finds whooping cough vaccine safe for pregnant women
"In Marin County, our primary focus is protecting infants and people at high risk of getting sick," Termini said. "The best thing people can do to protect themselves is to ensure they are up to date on the pertussis vaccination, practice proper respiratory and hand hygiene, and stay home if they are sick."
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People diagnosed with whooping cough should stay home for 21 days after coughing begins or for five days after the start of antibiotics.
For more information about the county's whooping cough response, people can visit the health department's website.
The Tamalpais Union High School District says while masking isn't required at this time, they're recommending it to anyone with a cough or cold symptoms.