By July 10 397,577 people had been tested for COVID-19 (14.2% of population of Qatar). 110,986 tested PCR-positive (4.0% of population), which yields a positivity rate of 27.9%. This rate increased and peaked on May 22, after which it has been declining and was 17.8%. on July 9. 
Males were 1.6 fold more likely to test PCR-positive, and Nepalese and Bangladeshis were most likely to test PCR positive.

Northwestern University

- National SARS-CoV-2 PCR testing and hospitalization database
- Community surveys
- Ad-hoc testing campaigns in workplaces and in residential areas
- Seroprevalence survey

Via Testing Method

Raddad L, Chemaitelly H, et al. Characterizing the Qatar Advanced-phase SARS-Sars-CoV-2 Epidemic. 19 July 2020. BioRxiv.  https://doi.org/10.1101/2020.07.16.20155317

Characterizing the Qatar Advanced-phase SARS-Sars-CoV-2 Epidemic

Analysis of the national SARS-CoV-2 PCR testing and hospitalization database

1,307 people participated in the community surveys varying in sex, age, nationality, and education. Some were randomly invited and some participated via an open announcement, but no major differences existed between these two groups.
156 people tested positive for SARS-CoV-2, resulting in a 14.9% prevalence. " After controlling for confounders, strong evidence for an association with positivity (p-value ≤0.05) was found for nationality, educational attainment, occupation, presence of symptoms, and seeking medical attention, but
not for sex, age, study recruitment/invitation, PHCC center location, seeking hospitalization, or history of contact with an index case. The differences were pronounced for nationality, occupation, presence of symptoms, and seeking medical attention."
"The proportion of asymptomatic individuals was 58.5% in those testing positive and 79.5% in those testing negative". Reporting 3+ symptoms was associated significantly with infection. 

PCR positivity in community survey

390 random PCR testing campaign were conducted in workplaces testing 22,834 individuals, and 48 campaigns in residential areas testing 3, 881 individuals. At least 1 infected individual was found in 72.3% of workplaces and 72.4% of residential areas. There was no evidence for differences in PCR point prevalence between the workplaces and residential areas, consistent with a widely disseminated epidemic. 

PCR positivity in the ad-hoc testing campaigns in workplaces and in residential areas

"A total of 32,970 individuals were tested for SARS-CoV-2 antibodies with the blood specimens drawn between May 12-July 12, with a median day of June 28. A total of 5,448 individuals had detectable antibodies. The weighted (for total population of Qatar) antibody prevalence was 24.0%". There were significant differences in antibody prevalence by sex and nationality. After controlling for confounders, odds of antibody positivity in males were 2.9-fold higher than females, and were highest among Bangladeshis and Nepalese, lowest among Qataris. Odds also increased incrementally with age.  Overall, antibody positivity was >88% among those who had their first positive PCR test >15 days before the antibody test." 

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