肿且有压痛的“热”关节可能提示急性化脓性关节炎。格兰氏染色显示许多嗜中性粒细胞，其中之一包含革兰阴性双球菌，提示淋病奈瑟菌感染。
A "hot" joint that is swollen and tender may indicate an acute suppurative arthritis. The gram stain shown here demonstrates many neutrophilic leukocytes, one of which contains gram negative intracellular diplococci indicative of Neisseria gonorrheae infection.