Shigella sonnei (the most common species in the U.S.) Shigella flexneri; Shigella boydii; Shigella dysenteriae; The transmission of most Shigella infections is caused by the bacterium passing from stools or soiled fingers of one person to
System maintenance. One advantage of the septic tank/absorption field system is that it has no moving parts, but it does require maintenance. Annual inspections of your septic system are recommended to ensure that it is working properly and to determine when scum and sludge in the septic tank should be cleaned out.
Preventive actions include: 1  Integrating land and water management to protect soils from erosion, salinization, and other forms of degradation. 2  Protecting the vegetative cover, which can be a major instrument for soil conservation against wind and water erosion.