Table 2.
The most dominant visual topic and its percentage in each textual topic.
| Textual topic | Dominant visual topic | n (%) |
| Dengue worldwide | Insect (pest or fly) | 334 (24.29) |
| Vaccine price | Poster or logo | 231 (17.88) |
| Poliovirus vaccine in Ethiopia | Baby | 3930 (91.43) |
| HPVa | Injection | 376 (13.60) |
| H1N1, swine, or bird flu | Injection | 275 (21.43) |
| Malaria | Insect (pest or fly) | 342 (21.30) |
| Vaccines and fertility | Female | 114 (71.5) |
| Debates of Republican candidates on vaccines and autism | Politician | 852 (20.97) |
| Chimps used for hepatitis research | Nature | 1021 (56.07) |
| Rabies | Dog | 1585 (36.91) |
| Zika | Insect (pest or fly) | 534 (23.56) |
| Meningitis vaccine for all UK babies | Baby | 373 (15.84) |
| Autism and MMRb | Communication | 410 (16.18) |
| Scientific report on vaccine | Biology or Bacteria | 299 (14.06) |
| Genetically modified organism | Food | 133 (7.53) |
| Ebola in Africa | Hospital, patient, or doctor | 473 (17.81) |
| Anticancer vaccines | Abstract image (cell or cartoon) | 182 (12.17) |
| HIV | Poster or logo | 147 (10.55) |
| Vaccine for soldier or veteran | Vehicle | 37 (6.9) |
| Promote vaccine | Baby | 255 (10.36) |
aHPV: human papillomavirus.
bMMR: measles, mumps, and rubella.