Covid vaccine, booster shots and flu shots are available at four clinics in October. (Photo: Cambridge Health Alliance via Facebook)

The Cambridge Public Health Department is offering free flu shots and Covid-19 vaccinations at the same four vaccine clinics this month. Residents can walk in, or they can register and make an appointment here.

The clinics will be held:

• Oct. 15 from 10 a.m. to 4 p.m. at the Citywide Senior Center, 806 Massachusetts Ave., Central Square
• Oct. 16 from 11 a.m. to 6 p.m. at the King Open School, 850 Cambridge St., Wellington-Harrington
• Oct. 22 from 2 to 8 p.m. at Reservoir Church, 170 Rindge Ave., North Cambridge
• Oct. 23 from noon to 6 p.m. at the Pisani Center, 131 Washington St., The Port

Interim chief public health officer Sue Breen had said last week that the city was planning to offer Covid shots, including boosters, alongside flu vaccinations. But details were not available until Tuesday, when the city announced the clinics in a press release on its website.

Other communities are also offering flu and Covid vaccinations together, including Pfizer booster shots. Studies have shown that getting both vaccines at the same time doesn’t cause serious side effects.

The registration process lets residents select the vaccines they want to get. It asks for insurance information, but people don’t need to have insurance and the vaccinations are free. The Tuesday announcement said the health department encourages unvaccinated people 12 and older, especially young people, to get Covid and flu shots. The percentage of older teens and people in their 20s who are fully vaccinated against the coronavirus continues to lag behind rates for other age groups.

Federal officials recommend that people should get a booster if they are over 65; or if they are over 18 and living in long-term care; or if they are 50 to 64 with underlying medical conditions. People may get a booster if they are from 18 to 49 with underlying medical conditions or if they are from 18 to 64 and work or live in situations that put them at high risk of getting infected. Only Pfizer boosters have been approved so far, and only for those who were vaccinated with the Pfizer vaccine.