article_snippet: Despite thorough investigations by authorities, the cause of the contamination is still unknown.
article_snippet: Human error is always the first explanation you should consider for a laboratory accident. '
article_snippet: Authorities have previously said Authorities are concerned that too few samples have been taken to decide whether livestock and domestic animals are at risk.
article_snippet: Only 39 soil samples were taken from the grounds and 13 from water - far less than the 100 recommended by previous research completed in Thailand.
article_snippet: Those results showed that there was no evidence that the bacteria had spread into the surrounding area, suggesting there was no public health risk.
highlights_snippet: Initial tests indicate that Initial tests has not spread to surrounding areas - which include a school and homes - but further tests are required .
  