The reservoir, or host, of Lassa virus is a rodent known as the "multimammate rat" of the genus Mastomys. It is not certain which species of Mastomys are associated with Lassa; however, at least two species carry the virus in Sierra Leone. Mastomys rodents breed very frequently, produce large numbers of offspring, and are numerous in the savannas and forests of West, Central, and East Africa. In addition, Mastomys generally readily colonize human homes. All these factors together contribute to the relatively efficient spread of Lassa virus from infected rodents to humans.

10 Ways to Keep Rodents Out of Your Home:


1. Keep food sealed in metal or class containers. This goes for both food in your kitchen as well as food kept in the garage or a storage area. These same rules apply to bird food and pet food.

2. Cover your trash well, and dispose of it quickly if you live in an area where you take the trash to a larger compactor. Garbage will naturally attract rodents.

3. Remove food waste from sinks or counters as soon as possible.

4. Throw away extra cardboard. This is another item that rodents like, and they’ll sometimes use it in their nests.

5. In your garage, regularly check and replace as necessary the rubber seal at the bottom of the door. This could be an easy entryway for rodents. Also, inspect and caulk the door frame for cracks or holes.

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