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Catching COVID twice or more isn't just a bad week — it may reshape your long-term health. A new Canadian study found that people with two or more COVID infections were 76% more likely to develop a new medical condition than those never infected. Respiratory issues and back problems were among the biggest risks, underscoring why preventing reinfection matters.
Getting COVID once is bad enough, but catching it again could have lasting consequences. A new study published in the Canada Communicable Disease Report found that adults who reported two or more COVID infections were 76% more likely to be diagnosed with a new medical condition compared to those who were never infected. The research analyzed data from nearly 9,000 Canadians surveyed between April 2022 and June 2023.
The conditions tracked spanned a wide range — from respiratory and cardiovascular disorders to mental illness, diabetes, and chronic fatigue syndrome. Repeat infections were linked to five times the odds of a new respiratory diagnosis and nearly four times the odds of developing back problems. Even a single severe first infection mattered: those with symptoms that disrupted daily life were 63% more likely to receive a new diagnosis.
By the Numbers:
Why it matters: The findings suggest COVID and chronic illness may have a two-way relationship — not just that people with existing conditions are more vulnerable, but that repeat infections may actively trigger new ones. Researchers say this reinforces the importance of vaccination, masking, and post-COVID monitoring to protect long-term health.
