Centuries: 17th century - 18th century - 19th century
Decades: 1670s 1680s 1690s 1700s 1710s - 1720s - 1730s 1740s 1750s 1760s 1770s
Years: 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
... that can cause disease.
There are many types of Pathogens. What follows is a beta list of the known categories of pathogens
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