View all text of Subpart C [§ 1250.40 - § 1250.53]
§ 1250.49 - Cleanliness of conveyances.
Conveyances while in transit shall be kept clean and free of flies and mosquitoes. A conveyance which becomes infected with vermin shall be placed out of service until such time as it shall have been effectively treated for the destruction of the vermin.