I think that the data is skewed in the United States, on vaccination rates, Covid death rates...Covid contact tracing. And part of that is that no state is consistent in the way data is collected. Case in point, in Florida, if someone dies of Covid, but they "live" in New York, the data is not reported as a "Covid" death in Florida. Makes zero sense to me.
Same with vaccination, the rates may not be reported accurately in Arizona, due to high numbers of "snowbirds". If they got their vaccines at their place of residence in summer, the vaccination is recorded at that county, in Montana for example, not AZ.
As for Contact Tracing, that seems to be a simple, straight forward job...call people who were in contact to a positive case. But, it is based on the county that person resides in. So, you only call people in the domicile of your assigned county. If they are out of your "county", the information goes to county health department where that person resides. Who knows when they will get that information?
The mismanagement and misinformation of government agencies is staggering. INMO. And part of the problem in the United States. Data analysis is only as good as the data...