john: epidemiologist jessica malaty rivera, thank you very much. jessica: thanks, john.ohn: in other news, russian strikes on ukraine have killed at least 20 people. it was the second night of aerial attacks since the trump administration stopped sharing satellite images with ukraine. in the donestk region, 11 people died in strikes that damaged apartment buildings. others were killed in areas along the front lines. u.s. and ukrainian officials are to meet next week in saudi arabia to start talks on a possible cease-fire. ukrainian president zelensky said ukraine is fully committed to the talks. and in syria, clashes over the last two days have left over 1000 people dead. fighting erupted between the interim government's security forces and loyalists of ousted president bashar al-assad. it's in a region home to the alawite minority, which was assad's longtime base of support. the government said it was responding to recent attacks from remnants of assad's forces. a british-based human rights monitoring group said 148 pro-assad fighters died in fighting and nearly 750 civ