With Canada’s rising COVID-19 cases, the U.S. government is warning its citizens to avoid travelling north of the border. On Jan. 10, the U.S. Centers for Disease Control and Prevention (CDC) issued a Level 4 Travel Notice that put Canada at the highest risk in its alert system.   “Avoid travel to Canada,” the notice says, citing a “very high level of COVID-19″ in the country.  “If you must travel to Canada, make sure you are fully vaccinated before travel,” it added. “Because of the current situation in Canada, even fully vaccinated travelers may be at risk for getting and spreading COVID-19 variants.” U.S. travellers are told to follow Canadian public health recommendations and requirements, including wearing a mask and maintaining six-foot social distancing. The CDC has also issued a Level 4 Travel Health Notice for 81 other countries around the world. Last month the Canadian government issued its own travel …