If it had started in the US, he'd have probably had a similar weak response unless it started somewhere like San Francisco, in which case I think you can look to Reagan's response to AIDS as something of a precedent for how Trump would have initially responded.
Completely agreed. The US has a horrendous record on handling epidemics, particularly in marginalized communities where the marginalized communities themselves are blamed for contracting illnesses. The homophobic and racist handling of AIDS by Reagan's admin would've probably been a blueprint for any standard Republican administration on handling a disease disproportionately affecting any disadvantaged community.