Adult Lifelines participants were asked whether they (had ever) suffered from any infectious diseases (section: Diseases & symptoms), in the context of additional questionnaire COVQ (no. 11)
| Questions English | Questions Dutch | [covtxx] | Variable | Assessment |
| Diphtheria / Could you indicate which (childhood) diseases you have had? | Difterie / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_a | COVID101A | COVQ 11 |
| Pertussis / Could you indicate which (childhood) diseases you have had? | Kinkhoest / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_b | COVID101B | COVQ 11 |
| Tetanus / Could you indicate which (childhood) diseases you have had? | Tetanus / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_c | COVID101C | COVQ 11 |
| Polio / Could you indicate which (childhood) diseases you have had? | Polio / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_d | COVID101D | COVQ 11 |
| Haemophilus influenza type B / Could you indicate which (childhood) diseases you have had? | Haemophilus influenza type B / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_e | COVID101E | COVQ 11 |
| Smallpox / Could you indicate which (childhood) diseases you have had? | Pokken / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_f | COVID101F | COVQ 11 |
| Pneumococcus / Could you indicate which (childhood) diseases you have had? | Pneumokokken / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_g | COVID101G | COVQ 11 |
| Rubella / Could you indicate which (childhood) diseases you have had? | Rodehond / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_h | COVID101H | COVQ 11 |
| Measles / Could you indicate which (childhood) diseases you have had? | Mazelen / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_i | COVID101I | COVQ 11 |
| Mumps / Could you indicate which (childhood) diseases you have had? | Bof / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_j | COVID101J | COVQ 11 |
| Meningococcal disease C / Could you indicate which (childhood) diseases you have had? | Meningokokken C / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_k | COVID101K | COVQ 11 |
| Chickenpox / Could you indicate which (childhood) diseases you have had? | Waterpokken / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_l | COVID101L | COVQ 11 |
| Herpes zoster / Could you indicate which (childhood) diseases you have had? | Gordelroos / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_m | COVID101M | COVQ 11 |
| Tuberculosis / Could you indicate which (childhood) diseases you have had? | Tuberculose / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_n | COVID101N | COVQ 11 |
| Scarlet fever / Could you indicate which (childhood) diseases you have had? | Roodvonk / Kunt u aangeven welke van de onderstaande (kinder)ziektes u gehad hebt? | diseases_adu_q_1_o | COVID101O | COVQ 11 |