A lot of information we have how the COVID-19 virus spreads in general. But what do we know about the detected and proven way of transmission:
- about which items (door handles, plates, salad bar, ...) or
- via which exact air route (large office?, in restaurant, with/without air conditioning, ...)
- via which direct human-human contact (handshake, kiss?, ...)
- or other?
There is a study on the spread in nursing homes. It describes whether and when people fell ill. There were also surveys, but unfortunately without information about where and how someone got infected. Especially when the exact day of an infection is determined, the circumstances should also be considered. Many, many messages we read, but no information about the exact way of transmission is available.
On the cruise ship Ruby princess are described 11 cases of secondary transmission. Secondary transmissions should be easily tracked because the 2 persons transmitter and receiver can be easily identified. A follow-up report seems not to be available.
Here, a large number of infections are examined and even subdivided where they originated in: homes, transport, food, entertainment, shopping and miscellaneous. However, it is not specified how the transmission was there in detail.
There are many presumptions about the possible ways of transmission. But which ways was proven already by the many surveys?