Another study finds loss of smell a symptom of Covid-19 infection, even if there is no fever or breathlessness.

https://medicalxpress.com/news/2020-10-loss-globally-symptom-covid-.html

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78% of participants in our community-based study with sudden onset loss of smell or taste had SARS-CoV-2 antibodies. The vast majority had mild symptoms and 40% did not report having a fever or cough.

Our findings suggest that people who notice a loss in their ability to smell every day house-hold odors such as
garlic, coffee and perfumes
should self-isolate and seek PCR testing.

Loss of sense of smell needs to be recognized globally by policy makers as a key symptom of COVID-19."

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