Hoyle's agar
Selective bacterial growth medium
Hoyle's agar is a selective medium that uses tellurite to differentially select Corynebacterium diphtheriae from other upper respiratory tract flora. The medium appears cream to yellow colored, and takes the form of a free-floating powder. It is a modification of Neill's medium.[1]
Hoyle's tellurite agar contains:
| Proteose peptone | 10 g/L |
| Beef extract | 10 g/L |
| Sodium chloride | 5 g/L |
| Blood, laked | |
| Tellurite | 0.35 g/L |
| Agar | 15 g/L |
The medium inhibits growth of Gram-negative bacteria and many Gram-positive bacteria, and reduction of the tellurite is characteristic of corynebacteria (though not entirely exclusive to them.) Microscopic examination of samples of suspected colonies, using Neisser differential staining, is required for confirmation.[2]
References
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Growth media / agar plates
| Gram positive |
| ||||||
|---|---|---|---|---|---|---|---|
| Gram negative |
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- BAF agar
- Czapek medium
- Dermatophyte test medium
- Malt extract agar
- MMN medium
- Potato dextrose agar
- Sabouraud agar
- YEPD
- YM
- Blood agar
- Chocolate agar
- Columbia blood agar
- Letheen broth
- Lysogeny broth
- Nutrient agar
- Plate count agar
- Trypticase soy agar
- Tryptic soy broth
- Zobell’s marine agar
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