How Wolbachia spreads
Wolbachia spread within wild Aedes aegypti populations through replacement technique:

Establishment and Spread Mechanism
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Strain Selection
Wolbachia wAlbB strain originating in Aedes albopictus was selected due to its stability under high temperature and hot climate
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Mosquito Release Strategy
The strategy to release both male and female Aedes aegypti carrying Wolbachia into dengue hotspots
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Maternal Transmission
Wolbachia are passed down naturally from mothers to their offsprings (vertical transmission)
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Cytoplasmic Incompatibility (CI)
Wolbachia-carrying male mosquitoes cause cytoplasmic incompatibility when they mate with wild-type female mosquitoes, leading to egg infertility