Humans encounter countless animal viruses every day, yet only a tiny fraction ever become global health threats. Most viruses fail because they cannot efficiently bind to human cells, evade our immune defenses, replicate effectively, or spread from one person to another. Environmental factors, wildlife ecology, and human behavior further reduce the chances of sustained transmission. Scientists are now using genomic surveillance, artificial intelligence, and a One Health approach to identify high-risk viruses before they emerge. While better vaccines strengthen pandemic preparedness, preventing dangerous animal-to-human spillover remains the most effective strategy for avoiding future pandemics.
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