Table 3 Prevalence of Omicron and vaccination efficacy with one and two doses in the countries with presence of Omicron (as defined in Section “Countries and time periods”).

From: Using survey data to estimate the impact of the omicron variant on vaccine efficacy against COVID-19 infection

Country

% Prevalence

Vac 1 dose

Vac 1 dose

Vac 2 doses

Vac 2 doses

Omicron

Efficacy Oct

Efficacy Dec

Efficacy Oct

Efficacy Dec

Argentina

0.83 [0.76, 0.91]

0.03 [0.00, 0.27]

–

0.53 [0.41, 0.62]

0.31 [0.15, 0.43]

Belgium

0.32 [0.29, 0.34]

–

–

0.55 [0.41, 0.65]

0.38 [0.26, 0.48]

Brazil

0.58 [0.52, 0.64]

0.20 [0.11, 0.28]

–

0.50 [0.44, 0.55]

0.33 [0.23, 0.41]

Colombia

0.35 [0.26, 0.44]

0.44 [0.35, 0.53]

0.36 [0.22, 0.47]

0.61 [0.55, 0.67]

0.53 [0.45, 0.61]

Denmark

0.47 [0.46, 0.49]

–

–

–

0.48 [0.38, 0.57]

France

0.26 [0.24, 0.27]

–

0.46 [0.35, 0.55]

–

0.44 [0.39, 0.49]

Germany

0.13 [0.13, 0.14]

–

0.44 [0.34, 0.53]

–

0.66 [0.63, 0.69]

India

0.33 [0.29, 0.38]

0.19 [0.05, 0.31]

0.07 [0.00, 0.26]

0.54 [0.47, 0.61]

0.49 [0.37, 0.58]

Italy

0.21 [0.19, 0.22]

–

0.66 [0.57, 0.72]

–

0.61 [0.56, 0.65]

Mexico

0.54 [0.49, 0.58]

0.36 [0.32, 0.40]

0.22 [0.14, 0.30]

0.66 [0.63, 0.68]

0.56 [0.52, 0.60]

Netherlands

0.30 [0.27, 0.33]

–

0.16 [0.00, 0.33]

0.41 [0.26, 0.53]

0.30 [0.19, 0.39]

Norway

0.25 [0.15, 0.36]

–

–

–

0.35 [0.11, 0.53]

Poland

0.03 [0.02, 0.04]

0.31 [0.13, 0.45]

0.44 [0.34, 0.52]

0.52 [0.45, 0.58]

0.58 [0.55, 0.62]

Portugal

0.23 [0.19, 0.27]

–

0.23 [0.00, 0.44]

–

0.33 [0.13, 0.49]

Romania

0.04 [0.00, 0.08]

0.65 [0.59, 0.70]

0.52 [0.33, 0.65]

0.58 [0.55, 0.61]

0.68 [0.60, 0.74]

Russia

0.29 [0.22, 0.36]

0.55 [0.43, 0.64]

0.30 [0.09, 0.46]

0.44 [0.38, 0.50]

0.46 [0.37, 0.53]

Slovakia

0.10 [0.03, 0.17]

–

–

0.50 [0.35, 0.61]

0.55 [0.47, 0.62]

South Africa

0.88 [0.81, 0.96]

0.29 [0.15, 0.40]

0.09 [0.00, 0.18]

0.64 [0.56, 0.70]

0.30 [0.23, 0.36]

Spain

0.46 [0.43, 0.50]

0.34 [0.09, 0.52]

0.30 [0.15, 0.43]

0.66 [0.55, 0.74]

0.26 [0.14, 0.36]

Sweden

0.34 [0.32, 0.37]

–

–

–

0.48 [0.36, 0.57]

Switzerland

0.39 [0.36, 0.41]

–

–

–

0.51 [0.42, 0.59]

Turkey

0.10 [0.08, 0.11]

–

–

0.49 [0.42, 0.55]

0.44 [0.34, 0.52]

United Kingdom

0.66 [0.65, 0.66]

–

–

0.36 [0.24, 0.46]

0.21 [0.08, 0.32]

Vietnam

0.02 [0.00, 0.06]

–

0.25 [0.00, 0.50]

–

–

  1. When data is insufficient to meet the defined selection criteria, it is omitted and replaced by “–”. The prevalence of Omicron is replicated from Table 2 for easy reference.
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