Register for COVID-19 testing at one of the County’s free test sites. Visit our page for up-to-date news, info and forms. The Office of Health Services is offering free flu shots to County residents 6 months of age and over. Visit our info page to begin. All Middlesex County buildings will remain closed to the general public until further notice – County services are available on an appointment basis, and all services related to the Nov 3 General Election are available on a walk-in basis.