Much as leftists insist that border controls are all about racism, the reality is that one of the prime reasons to have border controls is to protect against deadly diseases.
We're being reminded of the practical benefit of border controls as news emerges that the Biden administration is welcoming in illegal immigrants with tuberculosis, once the deadliest disease in America.
Looking back at American history, you'd think that leftists would be exquisitely sensitive to the risks of diseases coming to America from unchecked immigration.
Current estimates are that 90% of the indigenous people in the New World died following their first contact with European explorers because they lacked immunity to diseases common in Europe.
What we don't think of is robust Americans dying in the thousands from TB. However, before antibiotics, TB was one of the world's deadliest diseases, going back to ancient Egyptian times.
In her excellent The Plague and I, MacDonald wrote about the treatment experience and the disease's high contagion and mortality rates.
TB proved to be very vulnerable to antibiotics, and the disease faded from popular consciousness.
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