"patient zéro" meaning in French

{
  "forms": [
    {
      "form": "patients zéro",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "patients zéro"
      },
      "expansion": "patient zéro m (plural patients zéro)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Epidemiology",
          "orig": "fr:Epidemiology",
          "parents": [
            "Medicine",
            "Biology",
            "Healthcare",
            "Sciences",
            "Health",
            "All topics",
            "Body",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)"
      ],
      "id": "en-patient_zéro-fr-noun-R37U0C6D",
      "links": [
        [
          "epidemiology",
          "epidemiology"
        ],
        [
          "patient zero",
          "patient zero"
        ],
        [
          "index case",
          "index case"
        ]
      ],
      "raw_glosses": [
        "(epidemiology) patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "epidemiology",
        "medicine",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pa.sjɑ̃ ze.ʁo/"
    },
    {
      "audio": "LL-Q150 (fra)-Lyokoï-patient zéro.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav.ogg"
    }
  ],
  "word": "patient zéro"
}

{
  "forms": [
    {
      "form": "patients zéro",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "patients zéro"
      },
      "expansion": "patient zéro m (plural patients zéro)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Epidemiology"
      ],
      "glosses": [
        "patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)"
      ],
      "links": [
        [
          "epidemiology",
          "epidemiology"
        ],
        [
          "patient zero",
          "patient zero"
        ],
        [
          "index case",
          "index case"
        ]
      ],
      "raw_glosses": [
        "(epidemiology) patient zero, index case (the first documented patient in a disease epidemic within a population or the first case of interest in an epidemiological investigation)"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "epidemiology",
        "medicine",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pa.sjɑ̃ ze.ʁo/"
    },
    {
      "audio": "LL-Q150 (fra)-Lyokoï-patient zéro.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav/LL-Q150_%28fra%29-Lyoko%C3%AF-patient_z%C3%A9ro.wav.ogg"
    }
  ],
  "word": "patient zéro"
}