Immediate causes are not determined, but a high poultry density followed by a moist cold climate has led to the quick spread of the virus. With the highest population density in India, West Bengal has a high risk of the deadly virus spreading to humans. As per other accounts, bird flu has spread to half of the state due to delayed action, bad planning and mismanagement by Government of West Bengal. In many villages, people led by ruling party leaders resisted culling operations.. Agriculture Minister Sharad Pawar had slammed the Communist Party of India (Marxist) government for not reporting the bird flu epidemic early on. Shortage of staff for culling operation is one of the other reasons.