C
- C. auris infection — see Candida auris infection
- C. diff. Infection [Clostridium difficile Infection]
- C. gattii cryptococcosis
- C. neoformans cryptococcosis
- Campy (Campylobacter Infection)
- Campylobacter Infection (Campy) [Campylobacteriosis]
- Campylobacteriosis — see Campylobacter Infection
- Cancer
- Colorectal (Colon) Cancer
- Gynecologic Cancers
- Lung Cancer
- Prostate Cancer
- Skin Cancer
- Cancer and Flu
- see also Cancer
- see also Influenza
- Candida auris infection
- Canine Flu
- Capillaria Infection [Capillariasis]
- Capillariasis — see Capillaria Infection
- Carbapenem-resistant Enterobacterales (CRE)
- Carbapenem resistant Klebsiella pneumonia (CRKP) — see Klebsiella pneumoniae
- Cardiovascular Health — see Heart Disease
- Carpal Tunnel Syndrome — see Ergonomic and Musculoskeletal Disorders
- Carrion's Disease — see Bartonella Infection
- Cat Flea Tapeworm — see Tapeworm, Dog and Cat Flea
- Cats, Infections from
- Cat Scratch Disease (CSD) [Bartonella Infection]
- Cat Scratch Disease from Pets
- CCHF (Crimean-Congo hemorrhagic fever)
- CDI (Chronic Disease Indicators)
- Cercarial Dermatitis — see Swimmer's Itch
- Cerebral Palsy
- Cervical Cancer
- see also National Breast and Cervical Cancer Early Detection Program (NBCCEDP)
- Chagas Disease [Trypanosoma cruzi Infection]
- Chapare Hemorrhagic Fever (CHHF)
- Chest Cold — see Bronchitis
- CHHF (Chapare Hemorrhagic Fever)
- Chickenpox Vaccination
- Chickenpox [Varicella Disease]
- Chikungunya Fever (CHIKV)
- CHIKV (Chikungunya Fever)
- Childhood Arthritis
- Childhood Injuries
- Childhood Overweight and Obesity
- Chlamydia psittaci Infection
- Chlamydia trachomatis Disease — see Chlamydia
- Chlamydia [Chlamydia trachomatis Disease]
- Cholera [Vibrio cholerae Infection]
- Chronic Disease Indicators (CDI)
- Chronic Fatigue Syndrome — see Myalgic Encephalomyelitis/ Chronic Fatigue Syndrome
- Chronic Kidney Disease ( )
- Chronic Obstructive Pulmonary Disease (COPD)
- Chronic Traumatic Encephalopathy — see CTE
- Chronic Wasting Disease (CWD)
- Ciguatera Fish Poisoning
- Ciguatoxin — see Marine Toxins
- CJD, Classic (Classic Creutzfeldt-Jakob Disease)
- CKD (Kidney Disease)
- Classic Creutzfeldt-Jakob Disease (CJD, Classic)
- Clonorchiasis — see Clonorchis Infection
- Clonorchis Infection [Clonorchiasis]
- Clostridium botulinum Infection — see Botulism
- Clostridium difficile Infection — see C. diff. Infection
- Clostridium perfringens infection
- Clostridium tetani Infection — see Tetanus Disease
- Clotting Disorders
- CMV (Cytomegalovirus Infection)
- Coal Workers' Pneumoconioses — see Black Lung
- Coccidioidomycosis — see Valley Fever
- Cold, Common
- Colorado Tick Fever (CTF)
- Colorectal (Colon) Cancer
- Colorectal Cancer Control Program (CRCCP)
- Colorectal Cancer and Genetics
- see also Genetics and Genomics
- Common Cold — see Cold, Common
- Concussion — see Traumatic Brain Injury
- Congenital Hearing Loss — see Hearing Loss in Children
- Congenital Heart Defects
- Screening for Critical Congenital Heart Defects
- Conjunctivitis — see Pink Eye
- Cooley's Anemia
- COPD (Chronic Obstructive Pulmonary Disease)
- Coronavirus Disease 2019 [COVID-19]
- COVID-19 — see Coronavirus Disease 2019
- Coxiella burnetii Infection — see Q Fever
- CRE (Carbapenem-resistant Enterobacterales)
- Creutzfeldt-Jakob Disease, Classic — see Classic Creutzfeldt-Jakob Disease
- Crimean-Congo hemorrhagic fever (CCHF) [Nairovirus Infection]
- CRKP (Carbapenem resistant Klebsiella pneumonia )
- Crohn’s Disease — see Inflammatory Bowel Disease
- Cronobacter Infection
- Cryptococcosis, C. neoformans — see C. neoformans cryptococcosis
- Cryptosporidiosis — see Cryptosporidium Infection
- Cryptosporidium Infection [Cryptosporidiosis]
- CSD (Cat Scratch Disease)
- CTE [Chronic Traumatic Encephalopathy]
- see also Traumatic Brain Injury (TBI)
- CTF (Colorado Tick Fever)
- CWD (Chronic Wasting Disease)
- Cyanobacterial Algal Bloom-Associated Illness — see Harmful Algal Bloom (HAB)-Associated Illness
- Cyclospora Infection [Cyclosporiasis]
- Cyclosporiasis — see Cyclospora Infection
- Cysticercosis
- Cystoisospora Infection [Cystoisosporiasis]
- Cystoisosporiasis — see Cystoisospora Infection
- Cytomegalovirus Infection (CMV)