Abstract
Comparisons of growth and viability ofH. capsulatum on Sabouraud's medium with agar medium plus infusions of soil with and without starling (S. vulgaris) manure indicate that: 1. The largest number of viable conidia and smallest number of hyphal elements were developed on agar plus infusion of loam soil enriched with starling manure (Medium No. 3). 2. The largest volume of growth occurred on the Sabouraud's medium which was chiefly vegetative mycelium showing the lowest viability of any of the media tested. 3. Preliminary results indicate thatH. capsulatum will grow as well and produce as many viable conidia on dilute starling manure medium alone as when this medium is mixed or diluted with soil infusion. 4. Repeated passage ofH. capsulatum on infusion of naturally infected soil medium (No. 1) increased the number of total particles, the percentage of microconidia and the total viability. Similar comparisons with soil or starling manure media were made on the growth ofB. dermatitidis except that Sabouraud's medium was not included. These comparisons indicate that: 1. The largest number of viable conidia with a small number of hyphal elements was developed on starling manure infusion (medium No. 4). 2. Repeated passage ofB. dermatitidis on starling manure infusion (medium No. 4) resulted in an increase in the number of total particles, the percentage of microconidia, and the total viability.
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