Diagnosis kit and method of using the same

A diagnosis kit configured to detect whether or not an extraneous organism exists in a red blood cell by using a biological specimen containing the red blood cell, and a stain solution capable of staining nucleic acid, the kit comprising:

• a base plate;
• at least one diagnosis plate disposed at the base plate, the at least one diagnosis plate including
• a first chamber configured to store the stain solution and to have the biological specimen injected into the stain solution, the first chamber having a wall surface having a through-hole provided therein,
• a channel having one end-hole and another end opposite to the one end, the one end of the channel being connected to the first chamber via the through-hole, the channel being configured to extract the red blood cell from the biological specimen and the stain solution, and
• a test plate connected to the another end of the channel, and configured to receive the extracted red blood cell;
• and
• a second chamber provided in the base plate, and connected with the test plate for collecting a part of the biological specimen and a part of the stain solution.