In 1927, one of us1 reported observing a threadlike organism in two out of three cases presenting the clinical picture of Parinaud's conjunctivitis. The organisms were very delicate and were demonstrable only in thin sections stained by Verhoeff's modification of Gram's method. They resembled the organisms observed by Verhoeff in seventeen of eighteen cases,2 except that some threads showed apparent branching and in one case a large clump of threads radiating from a central clear area was seen. Dr. Verhoeff examined this material and stated that the organisms were identical with those observed in his cases. Aside from Verhoeff's cases, Keiper, Lemoine and Dunphy reported the presence of similar organisms in material sent to Dr. Verhoeff for staining.
At that time, cultures of a similar organism had been made only by Wherry and Ray from the preauricular gland of a patient, no conjunctival tissue being excised
GIFFORD SR, DILLON EE. THE CONJUNCTIVOGLANDULAR SYNDROME OF PARINAUDREPORT OF A CASE SHOWING A THREAD MOLD IN SECTIONS. Arch Ophthalmol. 1934;12(4):518–524. doi:10.1001/archopht.1934.00830170056007