I think that these pandemics are more frequent than many people give them credit for.
https://www.history.com/news/6-devastating-plagues
I was watching a documentary on the history of London that showed how plagues occurred frequently, and were slowed down only by the development of science-based infrastructure, such as an effective sewer system and clean water supply. However, my understanding was, and it is logical, that those with the least resources: (starting with situational awareness), space, living conditions, mobility and health are most likely to fall foul of such events. Richard's comments about lack of awareness, and thus lack of countermeasures, would support the proposition that those populations will be particularly hit. We have yet to see how this will play out in places like Bangladesh, India and Pakistan, with huge, dense and ill-informed populations and poor medical resources.
There is also a danger that either by accident or design, the pandemic will be introduced to the huge camps of refugees - especially those from the middle east and Africa, who live in the most squalid of conditions, with minimal services. In such a scenario dedicated supporters would likely be overwhelmed and likely to fall victim too. It would resolve a lot of inconvenient issues for many countries if those refugee numbers where whittled down.
If you think this is far-fetched, according to the research I have done, smallpox was brought to the Americas with the influx of gold miners. For British Columbia this occurred in 1862 when smallpox devastated the hitherto powerful native first nations, leaving them vulnerable to exploitation. There is debate that the epidemic was started deliberately by Frances Poole, with the connivance of the colonial powers, in an effort to undermine the hold of indigenous tribes over their resources.
The Center for Disease Control says natural smallpox epidemics develop slowly, take months to reach a climax and a common death toll is only about 30 percent of a population which has suffered an epidemic episode. Yet within only a few weeks 80% of the native populations had succumbed. The suggestion is that such intensity was deliberate, and certainly the colonial authorities, already aware of the disease in settled areas, did very little to provide medical assistance to coastal nations.