The Putnam County Department of Health will begin administering second doses of the Moderna COVID-19 vaccine today in Carmel. Putnam County Executive MaryEllen Odell says that vaccine requires two doses 28 days apart. Only those who were given the first dose by the Putnam County health department are eligible for a second dose from the department.  Odell says the supply is still limited, but the federal government said it will increase New York State’s vaccine supply by 20 percent for the next three weeks.  The state has very strict requirements on the distribution of the second doses. The health department is not allowed to use any of the second-dose shipment for first doses of the vaccine.  The health department has received a shipment of 900 doses for second-dose use.  Two more clinics will be held next week, one in Carmel on Monday,and the other in Philipstown on Thursday.