Just to be clear my question was rhetorical. You have to do an autopsy to have a reasonable guess about the cause. A 90 year old has a 13% chance of dying for a

Just to be clear my question was rhetorical. You have to do an autopsy to have a reasonable guess about the cause. A 90 year old has a 13% chance of dying for any reason within a year (in the US, see here: https://www.ssa.gov/oact/STATS/table4c6.html https://www.ssa.gov/oact/STATS/table4c6.html). If it's not the virus it may be their liver, or their heart, or, and this is interesting now, chronic respiratory diseases. This has been a leading cause of death for a long time (https://www.cdc.gov/nchs/fastats/leading-causes-of-death.htm https://www.cdc.gov/nchs/fastats/leading-causes-of-death.htm). >are there any other significant factors contribute to those people's death in that period? Multiple things can contribute. Our body is an extremely complex organism. Putting a death down to 100% this or that when in reality it's a lot more complicated isn't just imprecise, it's often flat out wrong. And just because events coincide doesn't mean there's causality. If 1000 people died on a day with severe thunderstorms around the country that doesn't mean the thunderstorms killed them all. When old people with a virus infection die it's reasonable to assume there could be a connection, but you can't just say everyone who tested positive in a given time died of the virus.