There are little differences in these messages. Maybe there is meaning in it, maybe fluff to seem individualized.

1. Most are vaccinated and make a point of how grateful they are about it. Some also boosted, a very few haven't mentioned vaccines at all.
2. Another difference is isolation or quarantine. The CDC has wavered on how long this should be and so are these people, from five days to two weeks to indefinite.
3. Another is symptoms. Many are fine and have no symptoms. A few mention "mild" (unspecified) symptoms--I only remember a "scratchy throat" specifically and that is a subjective symptom without an observable sign.