Anna‐Ursula Happel

829 total citations
41 papers, 555 citations indexed

About

Anna‐Ursula Happel is a scholar working on Microbiology, Epidemiology and Infectious Diseases. According to data from OpenAlex, Anna‐Ursula Happel has authored 41 papers receiving a total of 555 indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Microbiology, 15 papers in Epidemiology and 12 papers in Infectious Diseases. Recurrent topics in Anna‐Ursula Happel's work include Reproductive tract infections research (24 papers), Gut microbiota and health (10 papers) and Reproductive Health and Contraception (9 papers). Anna‐Ursula Happel is often cited by papers focused on Reproductive tract infections research (24 papers), Gut microbiota and health (10 papers) and Reproductive Health and Contraception (9 papers). Anna‐Ursula Happel collaborates with scholars based in South Africa, United States and Kenya. Anna‐Ursula Happel's co-authors include Heather B. Jaspan, Jo‐Ann S. Passmore, Christina Balle, Shaun Barnabas, Shameem Z. Jaumdally, Linda‐Gail Bekker, Hoyam Gamieldien, Rémy Froissart, Katherine Gill and Smritee Dabee and has published in prestigious journals such as Journal of Clinical Investigation, Nature Communications and SHILAP Revista de lepidopterología.

In The Last Decade

Anna‐Ursula Happel

38 papers receiving 552 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Anna‐Ursula Happel South Africa	14	243	191	149	121	99	41	555
Anne K. Bowlin United States	20	526 2.2×	325 1.7×	345 2.3×	107 0.9×	228 2.3×	41	1.0k
Daniela Machado Portugal	13	274 1.1×	246 1.3×	183 1.2×	50 0.4×	48 0.5×	20	551
Elke Lievens Belgium	7	412 1.7×	297 1.6×	262 1.8×	45 0.4×	107 1.1×	8	664
Guido Lopes dos Santos Santiago Belgium	11	327 1.3×	204 1.1×	252 1.7×	25 0.2×	51 0.5×	15	500
Erica L. Plummer Australia	20	646 2.7×	218 1.1×	345 2.3×	55 0.5×	52 0.5×	57	960
L. Latéy Bradford United States	12	265 1.1×	145 0.8×	209 1.4×	125 1.0×	79 0.8×	17	526
Nicole C. E. Imholz Netherlands	6	267 1.1×	259 1.4×	184 1.2×	50 0.4×	61 0.6×	7	516
Erik Brandsborg Sweden	10	140 0.6×	196 1.0×	87 0.6×	48 0.4×	24 0.2×	11	426
Yevgeniy Turovskiy United States	8	213 0.9×	211 1.1×	141 0.9×	32 0.3×	48 0.5×	9	440

Countries citing papers authored by Anna‐Ursula Happel

Since Specialization

Citations

This map shows the geographic impact of Anna‐Ursula Happel's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Anna‐Ursula Happel with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Anna‐Ursula Happel more than expected).

Fields of papers citing papers by Anna‐Ursula Happel

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Anna‐Ursula Happel. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Anna‐Ursula Happel. The network helps show where Anna‐Ursula Happel may publish in the future.

Co-authorship network of co-authors of Anna‐Ursula Happel

This figure shows the co-authorship network connecting the top 25 collaborators of Anna‐Ursula Happel. A scholar is included among the top collaborators of Anna‐Ursula Happel based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Anna‐Ursula Happel. Anna‐Ursula Happel is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Happel, Anna‐Ursula, Nonhlanhla Yende‐Zuma, Y Saïdi, et al.. (2025). Randomized trial of multi-strain Lactobacillus crispatus vaginal live biotherapeutic products after antibiotic therapy for bacterial vaginosis: study protocol for VIBRANT (vaginal lIve biotherapeutic RANdomized trial). Contemporary Clinical Trials Communications. 48. 101554–101554. 1 indexed citations

Gasper, Melanie, et al.. (2025). Immunology of infants who are HIV-exposed uninfected in the parental combination antiretroviral therapy era. The Lancet HIV. 12(11). e789–e801.

Kullin, Brian, Elloise du Toit, Sugnet Gardner‐Lubbe, et al.. (2024). Knowledge and perceptions of blood donors of the Western Cape Blood Services, South Africa, toward vaginal sample donation for biobanking. SHILAP Revista de lepidopterología. 6. 1446809–1446809.

Jao, Jennifer, Shan Sun, Anna‐Ursula Happel, et al.. (2024). Infectious Morbidity and All-cause Mortality of Infants HIV-exposed Uninfected Compared to Infants HIV-unexposed Uninfected in Botswana. The Pediatric Infectious Disease Journal. 44(3). 214–216. 1 indexed citations

Dabee, Smritee, Christina Balle, Maricianah Onono, et al.. (2023). Update on the Impact of Depot Medroxyprogesterone Acetate on Vaginal Mucosal Endpoints and Relevance to Sexually Transmitted Infections. Current HIV/AIDS Reports. 20(4). 251–260. 6 indexed citations

Jaumdally, Shameem Z., Smritee Dabee, Anna‐Ursula Happel, et al.. (2023). Copper intrauterine device increases vaginal concentrations of inflammatory anaerobes and depletes lactobacilli compared to hormonal options in a randomized trial. Nature Communications. 14(1). 499–499. 13 indexed citations

Nyangahu, Donald, Anna‐Ursula Happel, Yuli Wang, et al.. (2023). Bifidobacterium infantis associates with T cell immunity in human infants and is sufficient to enhance antigen-specific T cells in mice. Science Advances. 9(49). eade1370–eade1370. 9 indexed citations

Jaspan, Heather B., Caroline M. Mitchell, & Anna‐Ursula Happel. (2023). The vagina question: Can maternal vaginal fluid impact the infant gut microbiome and neurodevelopment?. Cell Host & Microbe. 31(7). 1084–1086. 4 indexed citations

Happel, Anna‐Ursula, Christina Balle, Enock Havyarimana, et al.. (2023). Cervicovaginal Human Papillomavirus Genomes, Microbiota Composition and Cytokine Concentrations in South African Adolescents. Viruses. 15(3). 758–758. 10 indexed citations

10.

Happel, Anna‐Ursula, Christian Diener, Sean M. Gibbons, et al.. (2023). Bifidobacterium infantis supplementation versus placebo in early life to improve immunity in infants exposed to HIV: a protocol for a randomized trial. BMC Complementary Medicine and Therapies. 23(1). 367–367. 2 indexed citations

11.

Balle, Christina, Blair Armistead, Anna‐Ursula Happel, et al.. (2022). Factors influencing maternal microchimerism throughout infancy and its impact on infant T cell immunity. Journal of Clinical Investigation. 132(13). 23 indexed citations

12.

Dabee, Smritee, Bryan P. Brown, Christina Balle, et al.. (2021). Comparison of Female Genital Tract Cytokine and Microbiota Signatures Induced by Initiation of Intramuscular DMPA and NET-EN Hormonal Contraceptives - a Prospective Cohort Analysis. Frontiers in Immunology. 12. 760504–760504. 7 indexed citations

13.

Balle, Christina, Katherine Gill, Shameem Z. Jaumdally, et al.. (2020). Hormonal contraception and risk of STIs and bacterial vaginosis in South African adolescents: secondary analysis of a randomised trial. Sexually Transmitted Infections. 97(2). 112–117. 6 indexed citations

14.

Happel, Anna‐Ursula, Brian Kullin, Hoyam Gamieldien, et al.. (2020). Exploring potential of vaginal Lactobacillus isolates from South African women for enhancing treatment for bacterial vaginosis. PLoS Pathogens. 16(6). e1008559–e1008559. 45 indexed citations

15.

Happel, Anna‐Ursula, Ravesh Singh, Koleka Mlisana, et al.. (2020). Testing the regulatory framework in South Africa – a single-blind randomized pilot trial of commercial probiotic supplementation to standard therapy in women with bacterial vaginosis. BMC Infectious Diseases. 20(1). 491–491. 19 indexed citations

16.

Froissart, Rémy, Hoyam Gamieldien, Heather B. Jaspan, et al.. (2019). Antimicrobial and inflammatory properties of South African clinical Lactobacillus isolates and vaginal probiotics. Scientific Reports. 9(1). 1917–1917. 43 indexed citations

17.

Dabee, Smritee, Shaun Barnabas, Katie Lennard, et al.. (2019). Defining characteristics of genital health in South African adolescent girls and young women at high risk for HIV infection. PLoS ONE. 14(4). e0213975–e0213975. 37 indexed citations

18.

Happel, Anna‐Ursula, D. William Cameron, Kenneth L. Rosenthal, et al.. (2019). Bacille Calmette-Guérin Vaccine Strain Modulates the Ontogeny of Both Mycobacterial-Specific and Heterologous T Cell Immunity to Vaccination in Infants. Frontiers in Immunology. 10. 2307–2307. 18 indexed citations

19.

Happel, Anna‐Ursula, Shameem Z. Jaumdally, Heather B. Jaspan, et al.. (2017). Probiotics for vaginal health in South Africa: what is on retailers’ shelves?. BMC Women s Health. 17(1). 7–7. 10 indexed citations

20.

Herrmann, Alexandra, Anna‐Ursula Happel, & Thomas Gramberg. (2016). SAMHD1 in Retroviral Restriction and Innate Immune Sensing - Should We Leash the Hound?. Current HIV Research. 14(3). 225–234. 3 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact