Table 1 Serological testing.

Red, severe pneumonia; blue, pneumonia; green, asymptomatic; black, PMBCs not available; N.D., not done.

PT IDELISA resultELISAIFAIFA titerMicroneutralization titerPRNT50
PT01Positive12.3Positive10063.51057
PT03Negative0.23Negative<1:10≤10≤20
PT05Positive6.1Positive100226.31432
PT08Positive4.1Positive100100.8592
PT09Positive4.93Positive100226.31170
PT10Positive5.1Positive100201.6912
PT11Positive2.3Positive1:1025.2148
PT18Positive2.2Positive10050.4370
PT19Positive2.98Positive10040278
PT02Positive2.02Positive1:1080930
PT04Borderline0.87Positive1:10≤1031
PT06Positive1.34Positive10015.943.5
PT07Borderline0.97Negative<1:10≤10128
PT20Positive4.4Positive1:10 weak40293
PT21Positive1.17Borderline1:10 weak≤1061
PT12Negative0.56Negative<1:10≤10≤20
PT13Negative0.36Negative<1:10≤10≤20
PT14Negative0.38Negative<1:10≤10≤20
PT15N.D.N.D.N.D.N.D.28.3200
PT16Positive3.4Positive100100.8301
PT17Positive1.85Positive10025.2247