A United States citizen who arrived in Malaysia after disembarking in Cambodia from the MS Westerdam cruise ship has tested positive for the new coronavirus, the Malaysian health ministry said on Saturday.The 83-year-old woman flew to Malaysia on Friday from Cambodia along with 144 other passengers from the ship, said the ministry.The woman and her 85-year-old husband were the only ones of the 145 to show symptoms of the Covid-19 disease, said the ministry, adding that her husband had tested…