Health,
1.) If HIV had been circulating in the American population for 10-30 years before it was recognized quarantining a couple thousand people would not have done anything. The amount of people that would have to be quarantined after a virus has been circulating that long would be astronomical and it would be just about impossible to track down everyone who may have been infected and quarantine them
2.) Looking at people’s passports won’t help because of the reasons I listed above. In order to have an affective quarantine you would need to quarantine not only West Africans but also anyone who had contact with one or with anyone who had contact with someone who had contact with one etc. it’s simply not possible. See the example i gave lior above.