Russians talk about the coronavirus over dinner or in hair salons, the conversation often turns to “antitela,” the Russian word for antibodies — the proteins produced by the body to fight infection.Even President Vladimir Putin referred to them this week in a conversation with his Turkish counterpart Recep Tayyip Erdogan, bragging about why he avoided infection even though dozens of people around him caught the coronavirus, including someone who spent a whole day with the Kremlin leader.“I have high titers,” Putin said, referring to the measurement used to describe the concentration of antibodies in the blood.