In San Francisco, city agencies clear out homeless encampments at a near constant rate.
Discarded needles were scattered across 41 blocks.
Dr. Lee Riley, an infectious disease expert at UC Berkeley, told NBC Bay Area that getting stuck by a disposed needle can pass on viral diseases like HIV and hepatitis B and C.
A whopping 91 blocks were dirtied with *****. The investigation found over 300 piles.
Los Angeles, an outbreak of hepatitis A has been linked to the city's 50,000 homeless people, who sometime defecate in the streets and spread the disease between tent cities.
Despite how dirty San Francisco may seem to many residents New York took the cake as No.1 in dirtiness, litter and pests index.
Los Angeles followed NYC at No.2 with a dirtiness index of 317.8.
