Media composition to revive leptospires stored at -80  °C

Cryobiology. 2022 Sep 27:S0011-2240(22)00099-2. doi: 10.1016/j.cryobiol.2022.09.007. Online ahead of print.ABSTRACTLeptospires are preserved by frequent sub-culturing in semisolid media due to the challenge of low recovery by freezing or liquid nitrogen methods. The present study evaluated three liquid EMJH medium compositions (Medium A: Leptospira medium base EMJH, Leptospira enrichment EMJH, 5-fluorouracil (3%), rabbit serum (1%) and calf serum (1%); Medium B: same as Medium A but without 5-fluorouracil; Medium C: same as Medium B but with the addition of sodium pyruvate) for the revival of leptospires after storage at -80 °C. A total of 18 Leptospira serovars cultured in Medium A was aliquoted into cryogenic vials and directly stored at -80 °C. A hundred microlitre from each serovar culture stored at -80 °C was sub-cultured on a selected time over a period of 30 months into Media A, B and C. Regrowth on Media B and C showed a better and faster recovery (89-100%) (p-value <0.05) compared to Medium A (67-100%). Leptospires can be stored longer at -80 °C and a good recovery could be obtained when sub-cultured on EMJH medium without 5-fluorouracil.PMID:36179819 | DOI:10.1016/j.cryobiol.2022.09.007

Source: Cryobiology - September 30, 2022 Category: Biology Authors: Noraini Philip Vasantha Kumari Neela Source Type: research