More research is needed to fully elucidate the lifecycle, but both larvae and adults appear to be infective. One recent case reported finding adult worms in the duodenum, which is the first presentation of adult worms not in the upper respiratory region. The adult worms might have been coughed up and reswallowed before settling in the duodenum.
Further research is required to fully comprehend the life cycle, but both larvae and adults appear capable of causing infection. A recent case revealed adult worms present in the duodenum, marking the first instance of adult worms not residing in the upper respiratory tract. It's possible these worms were coughed up and then swallowed again before settling in the duodenum.