that time had grown to doubt the authenticity of any Muslim cooperating with the British, conceptualising them as not truly Muslim and possibly as being spies. Britain's intellectuals ended up rejecting Robert Koch's (presently widely accepted) findings of cholera being caused by bacteria. They kept arguing that cholera must be caused by local factors and in a manner which cannot be mediated via quarantine. British scientists would continue publishing anti-Zamzam and anti-contagionist articles up to 1895 CE. Their anti-contagionist views would fall further and further away from scientific consensus in the following decades. Concurrently Ottoman authorities continued to invest into persistent and successful efforts seeking to maintain and improve water quality throughout Arabia. BBC allegation and responses In May 2011 CE, a BBC London investigation alleged that water taken from taps connected to the Zamzam Well contained high levels of nitrate and arsenic at levels three times the legal limit in the UK, the same levels found in illegal water purchased in the UK. Saudi Arabian authorities' claim The Saudi authorities rejected the BBC's claim and said that the water is fit for human consumption. An official from the Saudi Arabian embassy in London stated: "...water from the Zamzam well is not contaminated and is fit for human consumption. Genuine Zamzam water does not contain arsenic." The president of the Saudi Geological Survey (SGS), Zuhair Nawab, has stated that the Zamzam Well is tested on a daily basis, in a process involving the taking of three samples from the well. The BBC article concentrated on bottled water supplied by individuals rather than the Presidency of the Two Holy Mosques' Affairs, according to Fahd Turkistani, advisor to the General Authority of Meteorology and Environmental Protection. Turkistani stated that the Zamzam water pollution may have been caused by unsterilized containers used by illegal workers selling Zamzam water at Makkah gates. Council of British Hajjis In the same month that the BBC report was released, the Council of British Hajjis later declared that drinking Zamzam water was safe, contradicting the BBC report. The council noted that the Government of Saudi Arabia does not allow the export of Zamzam water for resale. They also stated that it was unknown whether the water being sold in the UK was genuine and that people should not buy it and should report the sellers to the Trading Standards if they saw it for sale. See also List