By Julie Steenhuysen CHICAGO (Reuters) – The United States declared monkeypox a public health emergency last week, an effort to bolster the U.S. response to contain the outbreak. The virus continues to be largely transmitted among gay and bisexual men, but experts say the disease could spill over into other populations, especially due to vaccine shortages. Monkeypox is spread by contact with puss-filled sores and is rarely fatal. Here is the state of monkeypox now and some other the populations U.S. experts believe may be at risk: WHO IS GETTING MONKEYPOX NOW? Last month, the World Health Orga…