In a culture where evil spirits are regularly welcomed in and where witchcraft is the norm, what sort of physical manifestations are we likely to see?

Can witchcraft curses have physical effects on other non-Christian tribesmen? I am hearing credible stories of people dropping dead or developing ailments sometimes from curses (psychosomatic perhaps?).

I was cursed myself but laughed it off and told them that it could only return to the person. What is the recommended prescription for being put under a curse?

Would evil spirits manifest differently in Africa, or Indo or New Guienea perhaps? And would it vary even moreso in a Western secular culture where atheism is the strategy of the Devil?

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"If a commission by an earthly king is considered a honor, how can a commission by a Heavenly King be considered a sacrifice?"
-- David Livingstone