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Table 1 Investigations and molecular diagnostic done to identify etiology

From: Rickettsial retinitis—an Indian perspective

Sr. no. Rickettsial sub-classification Weil-Felix test Chikungunya serology Dengue serology WNV and JE serology MP in blood film WIDAL PCR for scrub typhus
OX 2 OX K OX 19
1 Unclassified 1:1280 Negative 1:40 Negative Negative Not done Negative Negative Not done
2 ET Negative Negative 1:160 Negative Negative Negative Negative Negative Negative
3 Unclassified 1:160 1:160 1:320 Negative Negative Not done Negative Negative Not done
4 ITT 1:160 Negative 1: 160 Negative Negative Not done Negative Negative Not done
5 Unclassified 1:160 1:80 Negative Negative Negative Negative Negative Not done Negative
6 Unclassified 1:320 1: 40 1:80 Negative Negative Not done Not done Not done Not done
7 Unclassified 1:160 1: 160 1:160 Negative Negative Negative Not done Negative Negative
8 ITT 1: 320 Negative 1: 320 Negative Negative Not done Not done Not done Not done
9 ITT 1:320 Negative 1:160 Negative Negative Not done Negative Negative Not done
10 ITT 1:640 Negative 1:160 Negative Negative Not done Negative Negative Not done
  1. WNV West Nile virus, JE Japanese encephalitis, MP malaria parasite, WIDAL typhoid, ITT Indian tick typhus, ET epidemic/endemic typhus