"CD4+" meaning in English

{
  "forms": [
    {
      "form": "CD4+s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "CD4+ (countable and uncountable, plural CD4+s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English 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": "en",
          "name": "Immunology",
          "orig": "en:Immunology",
          "parents": [
            "Medicine",
            "Biology",
            "Healthcare",
            "Sciences",
            "Health",
            "All topics",
            "Body",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A helper T cell."
      ],
      "id": "en-CD4+-en-noun-v7cMEYSw",
      "links": [
        [
          "immunology",
          "immunology"
        ],
        [
          "helper T cell",
          "helper T cell"
        ]
      ],
      "raw_glosses": [
        "(immunology) A helper T cell."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "immunology",
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "CD4+"
}

{
  "forms": [
    {
      "form": "CD4+s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "CD4+ (countable and uncountable, plural CD4+s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms spelled with +",
        "English terms spelled with numbers",
        "English uncountable nouns",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Immunology"
      ],
      "glosses": [
        "A helper T cell."
      ],
      "links": [
        [
          "immunology",
          "immunology"
        ],
        [
          "helper T cell",
          "helper T cell"
        ]
      ],
      "raw_glosses": [
        "(immunology) A helper T cell."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "immunology",
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "CD4+"
}