1kg tobacco Virginia (Cigarette) - Mix of tobacco leaves -

*Correspondence: Rui Guo [email protected] Jia [email protected] Wang [email protected] This article was submitted to Infectious Diseases: Epidemiology and Prevention, a section of the journal Frontiers in Public Health Disclaimer All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers

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For many months, the handful of men, women and children, evaded capture running, running, then running some more, as much as 80 miles a day