OTTAWA—Health Canada says it is investigating reports a second vaccine may be linked to extremely rare cases of blood clots. The United States Centers for Disease Control and Prevention and the Food and Drug Administration issued a joint statement Tuesday recommending a “pause” in using the single-dose Johnson & Johnson vaccine after six women developed blood clots after being vaccinated. The clots were observed along with reduced platelet counts making the usual treatment for blood clots, the blood thinner heparin, potentially “dangerous.” Dr. Theresa Tam, Canada’s chief public health officer, also reports today that there are a record number of COVID-19 patients in Canada’s intensive care units. She says an average of 970 people have been in ICUs over the last week, and the highest seven-day average previously was 880 in mid-January. Prime Minister Justin Trudeau is also urging Canadians to continue following public health orders in the hopes of …