Which organism forms pale pink colonies and is pathogenic for animals including swine and horses?

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Multiple Choice

Which organism forms pale pink colonies and is pathogenic for animals including swine and horses?

Explanation:
Rhodococcus equi is known for producing pale pink (often salmon-pink) pigmented colonies on blood agar. It is a gram-positive, aerobic coccobacillus that can survive inside macrophages, and it is a significant veterinary pathogen, especially in young horses (foals) where it causes pneumonia, as well as in swine. The combination of the distinctive pink pigment and its well-established role as an animal pathogen makes it the best fit for this question. The other organisms do not consistently form pale pink pigmented colonies and are not major animal pathogens in swine and horses.

Rhodococcus equi is known for producing pale pink (often salmon-pink) pigmented colonies on blood agar. It is a gram-positive, aerobic coccobacillus that can survive inside macrophages, and it is a significant veterinary pathogen, especially in young horses (foals) where it causes pneumonia, as well as in swine. The combination of the distinctive pink pigment and its well-established role as an animal pathogen makes it the best fit for this question. The other organisms do not consistently form pale pink pigmented colonies and are not major animal pathogens in swine and horses.

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