Which of the following is NOT a health hazard associated with birds?

Chikungunya is primarily associated with mosquito bites, particularly from Aedes mosquitoes, and is not directly linked to birds or their droppings. It is a viral infection that can cause fever and severe joint pain, but it does not have a connection to bird-related health hazards.

In contrast, the other conditions listed are associated with birds or their droppings. Histoplasmosis is caused by a fungus that thrives in bird droppings and can lead to respiratory issues. Hantavirus is linked to rodents but can occasionally be tied indirectly to birds as part of the broader ecosystem. Cryptococcosis, caused by a yeast found in the environment, is commonly associated with pigeon droppings. Thus, Chikungunya stands out as the only option that does not fit the pattern of health hazards related to birds.