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To the Editor.—
I noticed that fungal culture tubes, when kept on the window sill and exposed to the sunlight, show a much slower growth rate than the tubes that are kept away from the sun.Growth at end of sixth day.Four Sabouraud agar culture tubes were inoculated with Trichophyton mentagrophytes. Tube 1 was kept away from the sun. Tubes 2, 3, and 4 were exposed to the sun for one, two, and three hours daily, respectively, for a total of six days. The figure shows the growth at the end of the sixth day. Preexposing the tubes to the sun before inoculating them did not affect the growth rate. Shielding the sunlight from the tubes by black paper abolished the inhibitory effect without altering the temperature, excluding the possibility of the heat being the inhibiting factor. Using other fungi like T rubrum, T schoenleinii, and Epidermophyton floccosum showed
Dilaimy MS. Sun and Fungi. Arch Dermatol. 1976;112(8):1175. doi:10.1001/archderm.1976.01630320073026