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.
Protection core. ï¶A protection core is designed to transform a distortion-free signal. even well into the overcurrent range. This enables the protective. relays to measure the fault current value accurately, even in very high. current conditions. ï¶Relays are required to perform in fault current type situations.