Question

The type of mastitis spread by head flies is

• A. Contagious mastitis
• B. Common mastitis
• C. Summer mastitis
• D. Winter mastitis

Hint:

Mastitis Types & Vectors:
SUMMER MASTITIS $\rightarrow$ Transmitted by HEAD FLIES (Hydrotaea irritans) in dry pasture cows; caused by Trueperella pyogenes.
Contagious Mastitis $\rightarrow \textit{Staphylococcus aureus} / \textit{Streptococcus agalactiae}$.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Bovine mastitis epizootiology: Summer Mastitis is an acute, suppurative, necrotizing infection of dry cows and heifers on pasture transmitted by the sheep head fly (Hydrotaea irritans) carrying Trueperella pyogenes.
Key Formula or Approach:
\[ \text{Vector: Sheep Head Fly (} \textit{Hydrotaea irritans}\text{)} \xrightarrow{\text{Bites Teat Canal}} \text{Transmits } \textit{Trueperella pyogenes} + \textit{Peptoniphilus} \implies \mathbf{Summer \text{ } Mastitis} \]

Step 2: Detailed Explanation:
In bovine udder pathology and mastitis epidemiology:
- Summer Mastitis (C): An acute, highly destructive, purulent form of clinical mastitis occurring predominantly in dry (non-lactating) cows and pregnant heifers grazing on lush, wooded pastures during warm summer months (July to September).
- It is transmitted biologically and mechanically by the Sheep Head Fly Teat Fly (Hydrotaea irritans), which feeds on teat end secretions and inoculates a synergistic polymicrobial consortium dominated by {Trueperella pyogenes (formerly Arcanobacterium Corynebacterium pyogenes) along with anaerobic bacteria (Peptoniphilus indolicus, Fusobacterium necrophorum), producing foul-smelling, thick yellowish pus and total destruction of the infected quarter.

Step 3: Final Answer:
Hence, the type of mastitis spread by head flies is Summer mastitis, corresponding to option (C).