H.contortus survives in warm and moist conditions. Transmission periods are usually considered to be between 15-37 ◦C (Van Wyke and Reynecke 2011). The R0 model predicts when climate is going to be suitable for parasite transmission.
Dry season between April and September. This is reflected in the Haemonchus risk graph. Haemonchus has got a lower transmission risk during this time. The wet season is between October to March. During this period there is a much higher transmission risk for Haemonchus.
Mozambique is generally a tropical climate with some temperate and steppe areas scattered along its western border with South Africa. It tends to rain closer to the coast. As a result, the risk changes in different areas of the country. Further work will soon show where and when these areas are most at risk.