“ Over the course of human history, smallpox claimed hundreds of millions of lives, far more than plague... and all the wars of the twentieth century combined, ” notes the book Scourge ​ — The Once and Future Threat of Smallpox.
” Sepanjang sejarah manusia, cacar merenggut ratusan juta nyawa, jauh melebihi sampar... dan semua perang pada abad kedua puluh, ” kata buku Scourge ​ — The Once and Future Threat of Smallpox.