COVID-19 Symptoms and Predictors 


(starts from day 5-6)


(starts from day 5-6)

New loss of taste or smell

(starts from day 1-3)

Muscle aches

(starts from day 5-6)

Vomiting or diarrhea

(starts from day 5-6)

„The occurrence of olfaction dysfunction with COVID-19 is demonstrated to be frequent, respectively from (…) 86% of cases.“ 1

„Olfactory dysfunction has been shown to be the strongest predictor of COVID-19 positivity when compared to other symptoms“ 2

1 Yan CH, Faraji F, Prajapati DP et al. Association of chemosensory dysfunction and Covid-19 in patients presenting with influenza-like symptoms. Int Forum Allergy Rhinol 2020;10(7):806-813.
2  Rocke J, Hopkins C, Philpott C et al. Is loss of smell a diagnostic marker in COVID-19: A systematic review and meta-analysis. Clin Otolaryngol 2020 Aug 1: 10.1111/coa.13620. doi: 10.1111/coa.13620.

Rigorous Clinical Data

Parameters Important for Clinical Use:

✓High Sensitivity (88.9% pooled)

✓High Specificity (91.1% pooled)

✓Capable of Early Detection as early as 3 days after infection long before any other symptom has appeared

✓Features Anosmia/Hyposmia test plus Symptom Questionnaire

✓Filters for “infection-suspects”

✓Fast & Easy – Anywhere, Anytime, by Anyone

✓Registered with FDA, CE, at BfArM and Health Canada

✓Has been used globally in many countries

In validation trial no. 2 and no. 3 below, a total of 415 people were tested with both Corowell and PCR at the same time. =>  1 False Positive and 1 False Negative.

Corowell is effective at early detection of COVID 19 symptoms as a screening tool and people suspected of infection the earliest than any other test on the market today.

Clinical & Scientific Evidence

Clinical & Scientific Report and References