The number of infections is likely much much higher than the confirmed cases (laboratories have only so many test kits available per day) but most people stay asymptomatic.
Do you have evidence of that in this case?
Viruses vary widely on how many are asymptomatic. My understanding is that having people be infectious and asymptomatic only happens with diseases that are well-adapted to their hosts. Which this one, having recently crossed a species barrier, isn't. (Its fatality rate is also high for the same reason.)
However that is a general understanding and I don't have data to base it on on this case. Do you?