TORONTO -- Countries with rising COVID-19 numbers 鈥� Canada among them 鈥� must get the curve under control before hospitals are inundated with huge numbers of people battling either the novel coronavirus or winter鈥檚 seasonal sicknesses, says a doctor with the World Health Organization.

鈥淲ell, certainly the winter months are very important because that鈥檚 when other illnesses appear,鈥� said Dr. Margaret Harris, who spoke to CTV鈥檚 Your Morning from Geneva on Monday.

鈥淭hat鈥檚 the time when respiratory illnesses really love to circulate in our communities.鈥�

That includes colds, flus, bronchitis, and pneumonia.

The world is rapidly closing in on a million deaths from COVID-19 and has surpassed 33 million cases, according to WHO numbers updated Monday.

鈥淪o we鈥檝e already got this terrible virus, and as you said, we are reaching an awful milestone.鈥�

Case numbers are rising in Canada and in many countries around the world. On Monday, Canada recorded 1,450 new cases in just Ontario and Quebec. Ontario鈥檚 700 new cases is the highest single-day COVID-19 increase ever recorded in the province.

Canada has now recorded 154,575 cases and 9,270 deaths, according to figures compiled by CTV News. Prime Minister Justin Trudeau said last week that a second wave is already underway in most of Canada that could make the fall 鈥渕uch worse鈥� than the spring.

Canada鈥檚 seven-day tally of new cases 鈥� 8,897 鈥� places it No. 26 on that score, . The U.S. ranks worst, with 305,412 new cases in the last week, bringing its total to more than 7 million. 

The WHO has called surging coronavirus cases in Europe a 鈥渧ery serious situation.鈥�

Harris says caseloads are rising because people are spending more time together, and holding more mass gatherings.

As COVID-19 numbers climb, it will place a heavy burden on hospitals that will also be dealing with seasonal illnesses. Cold weather can even bring an uptick in heart attacks because cold weather can constrict the flow of blood to the heart.

鈥淵our hospitals won鈥檛 be able to deal with all the things they have to do,鈥� said Harris. 鈥淪o that鈥檚 why it鈥檚 so critical to really suppress transmission of this virus right now.鈥�

It鈥檚 just as important to seek out knowledge from reputable sources, says Harris, including the WHO, national health departments, and universities.

鈥淥ne of the biggest problems right now is that misinformation is flying around the world a lot more quickly than the right information,鈥� she said.

鈥淲e all hear all sorts of stuff from friends and neighbours and social media and everything else, but go check it first, and before you pass anything check whether it鈥檚 true.鈥�

Harris says there is reason to be optimistic on the vaccine front.

The WHO is tracking more than 170 COVID-19 vaccine candidates that are being developed and tested around the world.

鈥淣ever have there been so many vaccines, so many scientists, so many groups working so hard to create such an important tool for humanity.鈥�

Nine vaccines are in Phase 3 clinical trials, says Harris, meaning they are being tested to see if they work 鈥渙ut in the wild鈥� to protect against transmission of the virus.

鈥淭o really know that, you have to give it to a lot of people, between 30,000 and 60,000. And half of them have to get the vaccine and half of them have to get something else, and you look to see if there is a difference.鈥�

To be really effective, the trial needs to be 鈥渄ouble blinded,鈥� where neither the researchers nor the trial participants know whether or not they got the vaccine.

Harris says it鈥檚 expected that results from the first of the Phase 3 trials will begin to be known at the end of this year or early next year.

鈥淚t鈥檚 still a while yet, but it鈥檚 still very good news.鈥�