Unverified50% confidenceFactExact time
The number of BSL-4 laboratories worldwide was only about 20 in the early 2000s and had exceeded 60 by the mid-2020s, distributed across more than 40 countries
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/6/2026
First Seen
Valid until: 1/4/2027
Sources
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